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Stigma (ϛ) is a ligature of the Greek letters sigma (Σ) and tau (Τ), which was used in writing Greek between the Middle Ages and the 19th century.It is also used as a numeral symbol for the number 6.
This requires 27 letters, so the 24-letter alphabet was extended by using three obsolete letters: digamma ϝ (also used are stigma ϛ or, in modern Greek, στ) for 6, qoppa ϙ for 90, and sampi ϡ for 900. This alphabetic system operates on the additive principle in which the numeric values of the letters are added together to form the total.
Greek numerals, also known as Ionic, Ionian, Milesian, or Alexandrian numerals, is a system of writing numbers using the letters of the Greek alphabet.In modern Greece, they are still used for ordinal numbers and in contexts similar to those in which Roman numerals are still used in the Western world.
Digamma/wau remained in use in the system of Greek numerals attributed to Miletus, where it stood for the number 6, reflecting its original place in the sequence of the alphabet. It was one of three letters that were kept in this way in addition to the 24 letters of the classical alphabet, the other two being koppa (ϙ) for 90, and sampi (ϡ ...
The OpenType font format has the feature tag "mgrk" ("Mathematical Greek") to identify a glyph as representing a Greek letter to be used in mathematical (as opposed to Greek language) contexts. The table below shows a comparison of Greek letters rendered in TeX and HTML. The font used in the TeX rendering is an italic style.
Early Greek print, from a 1566 edition of Aristotle. The sample shows the -os ligature in the middle of the second line (in the word μέθοδος), the kai ligature below it in the third line, and the -ou-ligature right below that in the fourth line, along many others. 18th-century typeface sample by William Caslon, showing a greatly reduced set of ligatures (-ου-in "τοῦ", end of first ...
Sigma's original name may have been san, but due to the complicated early history of the Greek epichoric alphabets, san came to be identified as a separate letter in the Greek alphabet, represented as Ϻ. [2] Herodotus reports that "san" was the name given by the Dorians to the same letter called "sigma" by the Ionians. [i] [3]
The letter now known as sigma took its name from sāmekh but its form from šin, while the letter San, which occurred in a few dialects only, took its name from šin but its place in the alphabet from ṣādē. A further Greek letter of uncertain origin, sampi, is found occasionally, and may represent an affricate, such as [t͡s].