Planetary symbols are used in astrology and traditionally in astronomy to represent a classical planet (which includes the Sun and the Moon) or one of the modern planets. The classical symbols were also used in alchemy for the seven metals known to the ancients, which were associated with the planets, and in calendars for the seven days of the week associated with the seven planets. The original symbols date to Greco-Roman astronomy; their modern forms developed in the 16th century, and additional symbols would be created later for newly discovered planets.
The seven classical planets, their symbols, days and most commonly associated planetary metals are:
The International Astronomical Union (IAU) discourages the use of these symbols in modern journal articles, and their style manual proposes one- and two-letter abbreviations for the names of the planets for cases where planetary symbols might be used, such as in the headings of tables.[1]
The modern planets with their traditional symbols and IAU abbreviations are:
The origins of the planetary symbols can be found in the attributes given to classical deities. The Roman planisphere of Bianchini (2nd century, currently in the Louvre, inv. Ma 540)[2] shows the seven planets represented by portraits of the seven corresponding gods, each a bust with a halo and an iconic object or dress, as follows: Mercury has a caduceus and a winged cap; Venus has a necklace and a shining mirror; Mars has a war-helmet and a spear; Jupiter has a laurel crown and a staff; Saturn has a conical headdress and a scythe; the Sun has rays emanating from his head; and the Moon has a crescent atop her head.
The written symbols for Mercury, Venus, Jupiter, and Saturn have been traced to forms found in late Greek papyri.[3][b]
Early forms are also found in medieval Byzantine codices which preserve horoscopes.[4]
The symbol for the Moon in a medieval Byzantine (11th c.) ms. The appearance in late Classical times was similar.[3]
The symbol for Mercury in late Classical (4th c.) and medieval Byzantine (11th c.) mss[3]
The symbol for Venus in late Classical (4th c.) and medieval Byzantine (11th c.) mss[3]
The disk with a ray as a symbol for the Sun in late Classical (4th c.) and medieval Byzantine (11th c.) mss[3]
The symbol for Mars in late Classical (6th c.) and medieval Byzantine (11th c.) mss.[3]
The symbol for Jupiter in late Classical (4th c.) and medieval Byzantine (11th c.) mss[3]
The symbol for Saturn in late Classical (4th & 5th c.) and medieval Byzantine (11th c.) mss. Cf. kappa-rho, ⟨κρ⟩.[3]
A diagram in the astronomical compendium by Johannes Kamateros (12th century) closely resembles the 11th-century forms shown above, with the Sun represented by a circle with a single ray, Jupiter by the letter zeta (the initial of Zeus, Jupiter's counterpart in Greek mythology), Mars by a round shield in front of a diagonal spear, and the remaining classical planets by symbols resembling the modern ones, though without the crosses seen in modern versions of Mercury, Venus, Jupiter and Saturn.[citation needed] These crosses first appear in the late 15th or early 16th century. According to Maunder, the addition of crosses appears to be "an attempt to give a savour of Christianity to the symbols of the old pagan gods."[5]
The modern forms of the classical planetary symbols are found in a woodcut of the seven planets in a Latin translation of Abu Ma'shar al-Balkhi's De Magnis Coniunctionibus printed at Venice in 1506, represented as the corresponding gods riding chariots.[6]
Early modern depiction of the planet symbols in an alchemical context (Musaeum Hermeticum, 1678)
Page spread (with the signs for Mars and Venus) from a 1515 illustrated edition of Abu Ma'shar al-Balkhi's De Magnis Coniunctionibus (in the by translation by Herman of Carinthia, c. 1140, editio princeps by Erhard Ratdolt of Augsburg, 1489).
Depiction of the planets in a 15th-century Arabic manuscript of Abu Ma'shar's "Book of nativities"[c]
Four-quarters-of-the-world symbol for EarthGlobus cruciger symbol for Earth
Wikimedia Commons has media related to Earth symbols.
Earth is not one of the classical planets, as "planets" by definition were "wandering stars" as seen from Earth's surface.
Earth's status as planet is a consequence of heliocentrism in the 16th century.
Nonetheless, there is a pre-heliocentric symbol for the world, now used as a planetary symbol for the Earth. This is a circle crossed by two lines, horizontal and vertical, representing the world divided by four rivers into the four quarters of the world (often translated as the four "corners" of the world): . A variant, now obsolete, had only the horizontal line: .[7]
A medieval European symbol for the world – the globus cruciger, (the globe surmounted by a Christian cross) – is also used as a planetary symbol; it resembles an inverted symbol for Venus.
The planetary symbols for Earth are encoded in Unicode at U+1F728🜨ALCHEMICAL SYMBOL FOR VERDIGRIS and U+2641♁EARTH.
The Olympian gods, atop a -shaped world
Stylized Earth symbol
A simple globus cruciger
Three globi crucigeri in the coat of arms of Maschwanden in Switzerland
In the flag of Uppland, the globe of the globus cruciger is stylized as a T-and-O map,
In this globus cruciger, the cross is surmounted on a celestial orb with stars
The crescent shape has been used to represent the Moon since antiquity. In classical antiquity, it is worn by lunar deities (Selene/Luna, Artemis/Diana, Men, etc.) either on the head or behind the shoulders, with its horns pointing upward.
The representation of the moon as a simple crescent with the horns pointing to the side (as a heraldic crescent increscent or crescent decrescent) is attested from late Classical times.
The same symbol can be used in a different context not for the Moon itself but for a lunar phase, as part of a sequence of four symbols
for "new moon" (U+1F311 🌑︎), "waxing" (U+263D ☽︎), "full moon" (U+1F315 🌕︎) and "waning" (U+263E ☾︎).
The Moon symbol, representing silver mining, in the municipal arms of Sala in Sweden
The Moon symbol in the municipal arms of Silvberg ('Silver Mountain') in Sweden
The symbol ☿ for Mercury is a caduceus (a staff entwined with two serpents), a symbol associated with Mercury / Hermes throughout antiquity. Some time after the 11th century, a cross was added to the bottom of the staff to Christianize the symbol.[3]
The god Hermes (Mercury) with his caduceus
The caduceus, copied from pottery
The caduceus in a tapestry, 3rd century
Mercury symbol, representing quicksilver mining, in the municipal coat of arms of Stahlberg, Rhineland-Palatinate, Germany.
Stylized Mercury symbol
Mercury for quicksilver
The symbol ☿ was once the designated symbol for hermaphroditic or 'perfect' flowers,[8] but botanists now use ⚥ for these.[9]
A related usage is for the 'worker' or 'neuter' sex among social insects that is neither male nor (due to its lack of reproductive capacity) fully female, such as worker bees.[10]
More recently, it has been used to indicate intersex, transgender, or non-binary gender.[11]
The Venus symbol, ♀, consists of a circle with a small cross below it.
It is conjectured to be a depiction of the hand-mirror of the goddess, which may also explain Venus's association with the planetary metal copper, as mirrors in antiquity were made of polished copper,[12]
though this is not certain.[3] The addition of the cross is relatively recent – in the Greek Oxyrhynchus Papyri 235, the symbols for Venus and Mercury did not have the cross on the bottom stem,[3] and Venus appears without the cross (⚲) in Johannes Kamateros' 12th-century Compendium of Astrology.[13]
Wikimedia Commons has media related to Sun symbols.
The modern astronomical symbol for the Sun, the circumpunct (U+2609☉SUN), was first used in the Renaissance. It possibly represents Apollo's golden shield with a boss.
Bianchini's planisphere, produced in the 2nd century, shows a circlet with rays radiating from it.[5][2]
In late Classical times, the Sun is attested as a circle with a single ray. A diagram in Johannes Kamateros' 12th century Compendium of Astrology shows the same symbol.[17]
This older symbol is encoded by Unicode as U+1F71A🜚ALCHEMICAL SYMBOL FOR GOLD in the Alchemical Symbols block. Both symbols have been used alchemically for gold, as have more elaborate symbols showing a disk with multiple rays or even a face.
A buckler with a sun symbol and dot at center
Stylized circumpunct symbol for the Sun
The Sun for gold
🜚, the medieval astronomical symbol for the Sun
Mars
Spear and shield symbol for Mars
Wikimedia Commons has media related to Mars symbols.
The Mars symbol, ♂, is a depiction of a shield and a spear, indicating the god of war.[18][19]
It is also the old and obsolete symbol for iron in alchemy. In zoology and botany, it is used to represent the male sex (alongside the astrological symbol for Venus representing the female sex),[14] following a convention introduced by Linnaeus in the 1750s.[8]
The symbol dates from at latest the 11th century, at which time it was an arrow across or through a circle, thought to represent the shield and spear of the god Mars; in the medieval form, for example in the 12th-century Compendium of Astrology by Johannes Kamateros, the spear is drawn across the shield.[17] The Greek Oxyrhynchus Papyri show a different symbol,[3] perhaps simply a spear.[2]
3rd-century coin with Mars on the reverse, with lance and shield. The same symbols were used for Athena (Pallas).
Mars with spear and shield, Pompeii.
The Mars symbol, representing iron mining, in the municipal coat of arms of Karlskoga in Sweden
The Mars symbol in the municipal coat of arms of Loppi in Finland
Mars symbol in the patch for NASA's Viking mission
Stylized Mars symbol. The spear partly crosses the shield.
The Mars symbol was used as the symbol for iron
Its Unicode codepoint is U+2642♂MALE SIGN (♂).
The symbol for Jupiter, ♃, was originally a Greek zeta, Ζ, with a stroke indicating that it is an abbreviation (for Zeus, the Greek equivalent of Roman Jupiter).
Salmasius and earlier attestations show that the symbol for Saturn, ♄, derives from the initial letters (Kappa, rho) of its ancient Greek name Κρόνος (Kronos), with a stroke to indicate an abbreviation.[8] By the time of Kamateros (12th century), the symbol had been reduced to a shape similar to a lower-case letter eta η, with the abbreviation stroke surviving (if at all) in the curl on the bottom-right end.
A ligature of kappa ϰ and rho ϱ for Kronos, the ancestor of the symbol for Saturn
Modern discoveries
Uranus
Platinum symbol for UranusHerschel monogram for Uranus
The symbols for Uranus were created shortly after its discovery in 1781. One symbol, ⛢, invented by J. G. Köhler and refined by Bode, was intended to represent the newly discovered metal platinum; since platinum, commonly called white gold, was found by chemists mixed with iron, the symbol for platinum combines the alchemical symbols for iron, ♂, and gold, ☉.[20][21]
Gold and iron are the planetary metals for the Sun and Mars, and so share their symbols. Several orientations were suggested, but an upright arrow is now universal.
Another symbol, , was suggested by Lalande in 1784. In a letter to Herschel, Lalande described it as "a globe surmounted by the first letter of your name".[22]
The platinum symbol tends to be used by astronomers, and the monogram by astrologers.[23]
For use in computer systems, the symbols are encoded U+26E2⛢ASTRONOMICAL SYMBOL FOR URANUS and U+2645♅URANUS.
The planetary symbols as rendered in 1784, including the newly discovered Uranus (left)[20]
The Uranus platinum symbol on William Herschel's coat of arms (center, blue background)
Stylized Uranus monogram
Neptune
Trident symbol for Neptune
Several symbols were proposed for Neptune to accompany the suggested names for the planet. Claiming the right to name his discovery, Urbain Le Verrier originally proposed to name the planet for the Roman godNeptune[24]
and the symbol of a trident,[25]
while falsely stating that this had been officially approved by the French Bureau des Longitudes.[24] In October, he sought to name the planet Leverrier, after himself, and he had loyal support in this from the observatory director, François Arago,[26]
who in turn proposed a new symbol for the planet, .[27]
However, this suggestion met with resistance outside France,[26] and French almanacs quickly reintroduced the name Herschel for Uranus, after that planet's discoverer Sir William Herschel, and Leverrier for the new planet,[28]
though it was used by anglophone institutions.[29]
Professor James Pillans of the University of Edinburgh defended the name Janus for the new planet, and proposed a key for its symbol.[25] Meanwhile, Struve presented the name Neptune on December 29, 1846, to the Saint Petersburg Academy of Sciences.[30]
In August 1847, the Bureau des Longitudes announced its decision to follow prevailing astronomical practice and adopt the choice of Neptune, with Arago refraining from participating in this decision.[31]
The planetary symbol was Neptune's trident, with the handle stylized either as a crossed , following Mercury, Venus, Jupiter, Saturn, and the asteroids, or as an orb , following the symbols for Uranus, Earth, and Mars.[7] The crossed variant is the more common today.
For use in computer systems, the symbols are encoded as U+2646♆NEPTUNE and U+2BC9⯉NEPTUNE FORM TWO.
Athena (Pallas) with her lance and Poseidon (Neptune) with his trident. These weapons became the symbols of the planets Pallas and Neptune, respectively.
Poseidon with a trident, 6th century BCE
Poseidon with a trident, 6th century CE
Stylized Neptune symbol (orb base)
Stylized Neptune symbol (cross base)
⯉, the obsolete Le Verrier monogram for Neptune
Pluto
Bident symbol for PlutoPercival Lowell monogram for Pluto
Pluto was almost universally considered a planet from its discovery in 1930 until its re-classification as a dwarf planet (planetoid) by the IAU in 2006. Planetary geologists[32]
and astrologers continue to treat it as a planet. The original planetary symbol for Pluto was , a monogram of the letters P and L. Astrologers generally use a bident with an orb. NASA has used the bident symbol since Pluto's reclassification. These symbols are encoded as U+2647♇PLUTO and U+2BD3⯓PLUTO FORM TWO.
Wikimedia Commons has media related to Pluto symbols.
Pluto holding a bident
Pluto with a bident
Pluto symbol stylized as an inverted Mercury
Pluto compared in size to Earth's moon in a NASA publication
⯖, an astrological symbol used for Pluto in Germany and Denmark, representing Pluto's orbit crossing Neptune's
⯔, an astrological symbol used in the Mediterranean and Germany. The globe at bottom may be larger or omitted altogether.
Minor planets
"Designation of celestial bodies" in a German almanac printed 1850[33]
In the late 20th century, astrologers abbreviated the symbol for 4 Vesta (the sacred fire of Vesta, encoded U+26B6⚶VESTA),[34]
and introduced new symbols for 5 Astraea (, a stylised % sign, shift-5 on QWERTY keyboards for asteroid 5), 10 Hygiea encoded U+2BDA⯚HYGIEA)[35] and for 2060 Chiron, discovered in 1977 (a key, U+26B7⚷CHIRON).[34] Chiron's symbol was adapted as additional centaurs were discovered; symbols for 5145 Pholus and 7066 Nessus have been encoded in Unicode.[35]
The abbreviated Vesta symbol is now universal, and the astrological symbol for Pluto has been used astronomically for Pluto as a dwarf planet.[36]
In the early 21st century, symbols for the trans-Neptunian dwarf planets have been given Unicode codepoints, particularly Eris (the hand of Eris, ⯰, but also ⯱), Sedna, Haumea, Makemake, Gonggong, Quaoar and Orcus which are in Unicode. All (except Eris, for which the hand of Eris is a traditional Discordian symbol) were devised by Denis Moskowitz, a software engineer in Massachusetts.[36][37]
Other symbols have also been invented by Moskowitz, for some smaller TNOs as well as many planetary moons. (Charon in particular coincidentally matches a symbol already existing in Unicode as an astrological Pluto.) However, these have not been broadly adopted.[36][38]
From 1845 to 1855, many symbols were created for newly discovered asteroids. But by 1851, the spate of discoveries had led to a general abandonment of these symbols in favour of numbering all asteroids instead.[40]
^ abIn order to have one-letter abbreviations for every planet, the IAU recommends 'H' (Hermes) for Mercury and 'M' for Mars. In the unlikely event a satellite were ever discovered around Mercury, its official abbreviation would be H1.
^
"It is now possible to trace the medieval symbols for at least four of the five planets to forms that occur in some of the latest papyrus horoscopes ([ P.Oxy. ] 4272, 4274, 4275 [...]). Mercury's is a stylized caduceus. ... The ideal form of Mars' symbol is uncertain, and perhaps not related to the later circle with an arrow through it." — Jones (1999)[3]
^BNF Arabe 2583 folio 15v: Saturn is shown as a black bearded man, kneeling and holding a scythe or axe; Mercury is shown as a scribe holding an open codex; Jupiter as a man of the law wearing a turban; Venus as a lute-player; Mars as a helmeted warrior holding a sword and the head of an enemy.
^
"In his Systema Naturae (Leyden, 1735) he [Linnaeus] used them with their traditional associations for metals. Their first biological use is in the Linnaean dissertation Plantae hybridae xxx sistit J.J. Haartman (1751) where in discussing hybrid plants Linnaeus denoted the supposed female parent species by the sign ♀, the male parent by the sign ♂, the hybrid by ☿: 'matrem signo ♀, patrem ♂ & plantam hybridam ☿ designavero'. In subsequent publications he retained the signs ♀ and ♂ for male and female individuals but discarded ☿ for hybrids; the last are now indicated by the multiplication sign ×."
"Linnaeus's first general use of the signs of ♀ and ♂ was in his Species Plantarum (1753) written between 1746 and 1752 and surveying concisely the whole plant kingdom as then known. ... In order to save space Linnaeus employed the astronomical symbols of Saturn, Jupiter, Mars and the Sun to denote woody, herbaceous perennial, biennial and annual plants respectively [ed.: the orbital periods of Saturn, Jupiter, Mars and Earth about the Sun are 29, 12, 2, and 1 year] ... and Mercury, Mars and Venus for the hermaphrodite, male and female conditions" ...
"Later, in his Mantissa Plantarum (1767) and Mantissa Plantarum altera (1771), Linnaeus regularly used ♂, ♀ and ☿ for male, female and hermaphrodite flowers respectively. Their aptness made them easy to remember and their convenience led to their general acceptance in zoology as well as botany. Koelreuter found them especially convenient when recording his experiments in hybridization; as late as 1778 he used the sign ☿ to denote a hybrid plant." — Stearn (1962)[8]
^
Glossed in the official Unicode code chart as " = Venus = alchemical symbol for copper → 1F469 👩 woman → 1F6BA 🚺 women's symbol".
[15]
^The raised fist symbol is attributed to Robin Morgan, in the 1960s: "Morgan designed the universal logo of the women's movement, the woman's symbol centered with a raised fist."[16]
^
Rehder, Dieter (2011). Chemistry in Space: From interstellar matter to the origin of life. Wiley-VCH. The symbol, the stylized hand mirror of the Goddess Venus, also represents femininity. It has also been used for the element copper: Mirrors had been manufactured from polished copper.
^
Maunder, A.S.D. (1934). "The origin of the symbols of the planets". The Observatory. 57: 238–247. Bibcode:1934Obs....57..238M.
^ ab
Baum, Richard; Sheehan, William (2003). In Search of Planet Vulcan: The ghost in Newton's clockwork universe. Basic Books. pp. 109–110. ISBN0-7382-0889-2.
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