Samekh or samech is the fifteenth letter of the Semitic abjads, including Phoenician sāmek 𐤎, Hebrew alphabet sāmeḵ , Aramaic alphabet samek 𐡎, and Syriac alphabet semkaṯ ܣ. Samekh is the only letter of the Semitic abjad that has no surviving descendant in the Arabic alphabet; however, it was present in the Nabataean alphabet, the Arabic alphabet's immediate predecessor, as the letter simkath , which was related to the Ancient North Arabian 𐪏 and South Arabian 𐩯. The gematria of samekh is 60. The page has Arabic س and Ge'ez ሰ in the cognate letters, because they are similar in pronunciation.
Samekh represents a voiceless alveolar fricative . In the Hebrew language, the samekh has the same pronunciation as the left-dotted shin .
In Arabic, samekh is replaced by the letter sīn (, ) which is the 15th letter in the common Abjadi order, and the 12th letter in the Hija'i order, it has the same Abjad numerals of 60 in the common Abjadi order.
The shape of samek undergoes complicated developments. In archaic scripts, the vertical stroke can be drawn either across or below the three horizontal strokes. The closed form of Hebrew samek is developed only in the Hasmonean period.Frank Moore Cross, Leaves from an Epigrapher's Notebook: Collected Papers in Hebrew and West Semitic Palaeography and Epigraphy (2018), p. 30 .
The Phoenician letter gave rise to the Greek alphabet xi (Ξ), whereas its name may also be reflected in the name of the otherwise unrelated Greek letter sigma.
The archaic "grid" shape of Western Greek xi () was adopted in the early Etruscan alphabet (𐌎 esh), but was never included in the Latin alphabet. The letter samekh is currently the only letter of the Semitic abjad that has no surviving descendant in the Arabic alphabet, and the letter س corresponds exclusively to ש rather than ס.
The history of the letters expressing sibilants in the various Semitic alphabets is somewhat complicated, due to different mergers between Proto-Semitic phonemes. As usually reconstructed, there are four plain Proto-Semitic coronal Voicelessness fricative phonemes (not counting emphatic ones) that evolved into the various voiceless sibilants of its daughter languages, as follows:
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ס | ס | ס |
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