G
G, or g, is the seventh letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages, and others worldwide. Its name in English is gee (pronounced /ˈdʒiː/), plural gees.[1]
The lowercase version can be written in two forms: the single-storey (sometimes "opentail") 
and the double-storey (sometimes "looptail") 
. The former is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children.
The evolution of the Latin alphabet's G can be traced back to the Latin alphabet's predecessor, the Greek alphabet. The voiced velar stop was represented by the third letter of the Greek alphabet, gamma (Γ), which was later adopted by the Etruscan language. Latin then borrowed this "rounded form" of gamma, C, to represent the same sound in words such as recei, which was likely an early dative form of rex, meaning "king", as found in an "early Latin inscription."[2] Over time, however, the letter C shifted to represent the unvoiced velar stop, leading to the displacement of the letter K. Scholars believe that this change can be attributed to the influence of the Etruscan language on Latin.[2]
Afterwards, the letter 'G' was introduced in the Old Latin period as a variant of 'C' to distinguish voiced /ɡ/ from voiceless /k/, and G was used to represent a voiced velar from this point on and C "stood for the unvoiced velar only".[2]
The recorded originator of 'G' is freedman Spurius Carvilius Ruga, who added letter G to the teaching of the Roman alphabet during the 3rd century BC:[3] he was the first Roman to open a fee-paying school, around 230 BC. At this time, 'K' had fallen out of favor, and 'C', which had formerly represented both /ɡ/ and /k/ before open vowels, had come to express /k/ in all environments.
Ruga's positioning of 'G' shows that alphabetic order related to the letters' values as Greek numerals was a concern even in the 3rd century BC. According to some records, the original seventh letter, 'Z', had been purged from the Latin alphabet somewhat earlier in the 3rd century BC by the Roman censor Appius Claudius, who found it distasteful and foreign.[4] Sampson (1985) suggests that: "Evidently the order of the alphabet was felt to be such a concrete thing that a new letter could be added in the middle only if a 'space' was created by the dropping of an old letter."[5]