Jones, Alexander (1999). Astronomical papyri from Oxyrhynchus. pp. 62-63. ISBN0-87169-233-3. «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.»Error en la cita: Etiqueta <ref> no válida; el nombre «jones-1999» está definido varias veces con contenidos diferentes
Stearn, William T. (May 1962). «The Origin of the Male and Female Symbols of Biology». Taxon11 (4): 109-113. doi:10.2307/1217734. «The origin of these symbols has long been a matter of interest to scholars. Probably none now accepts the interpretation of Scaliger that ♂ represents the shield and spear of Mars and ♀ Venus's looking-glass. All the evidence favours the conclusion of the French classical scholar Claude de Saumaise (Salmasius, 1588-1653) that these symbols, as also those for Saturn, Mercury and Jupiter, are derived from contractions in Greek script of the Greek names of the planets which are Kronos (Saturn), Zeus (Jupiter), Thouros (Mars), Phosphoros (Venus) and Stilbon (Mercury). As observed by Linnaeus's one-time student Johann Beckmann in his History of Inventions (English transl., 1797), to understand their origin 'we must make ourselves acquainted with the oldest form of these characters which in all probability, like those used in writing, were subjected to many changes before they acquired that form which they have at present'.»
Stearn, William T. (May 1962). «The Origin of the Male and Female Symbols of Biology». Taxon11 (4): 109-113. ISSN0040-0262. doi:10.2307/1217734. «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.»
Webb, Stephen (2018). «Planet Venus». Clash of Symbols. Cham Springer International Publishing. ISBN978-3-319-71349-6. «The symbol for Venus, is associated with several other concepts: it represents the female sex, for example, and the chemical element copper. But why should symbolise Venus or femininity or copper? It's possible the reason could date back as far back as 4000 BC, when Mesopotamian artisans made mirrors from polished copper. If you were to draw a hand mirror even nowadays, you'd probably come up with something similar to ♀, the circle representing the mirror itself and the cross representing the handle. So, the stylised depiction of a hand mirror, could quite plausibly have become the symbol for copper in a time when mirrors were made from metal rather than glass. And since Aphrodite was often depicted admiring her beauty in a mirror, the symbol came to represent femininity – and thence the planet Venus. The story at least seems plausible.»
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Maunder, A. S. D. (August 1934). «The origin of the symbols of the planets». The Observatory57: 238-247. Bibcode:1934Obs....57..238M.
Gingerich, Owen (October 1958). «The Naming of Uranus and Neptune». Astronomical Society of the Pacific Leaflets8 (352): 9-15. Bibcode:1958ASPL....8....9G.
Stearn, William T. (May 1962). «The Origin of the Male and Female Symbols of Biology». Taxon11 (4): 109-113. doi:10.2307/1217734. «The origin of these symbols has long been a matter of interest to scholars. Probably none now accepts the interpretation of Scaliger that ♂ represents the shield and spear of Mars and ♀ Venus's looking-glass. All the evidence favours the conclusion of the French classical scholar Claude de Saumaise (Salmasius, 1588-1653) that these symbols, as also those for Saturn, Mercury and Jupiter, are derived from contractions in Greek script of the Greek names of the planets which are Kronos (Saturn), Zeus (Jupiter), Thouros (Mars), Phosphoros (Venus) and Stilbon (Mercury). As observed by Linnaeus's one-time student Johann Beckmann in his History of Inventions (English transl., 1797), to understand their origin 'we must make ourselves acquainted with the oldest form of these characters which in all probability, like those used in writing, were subjected to many changes before they acquired that form which they have at present'.»
Stearn, William T. (May 1962). «The Origin of the Male and Female Symbols of Biology». Taxon11 (4): 109-113. ISSN0040-0262. doi:10.2307/1217734. «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, William T. (May 1962). «The Origin of the Male and Female Symbols of Biology». Taxon11 (4): 109-113. ISSN0040-0262. doi:10.2307/1217734. «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.»
