A letter is a grapheme (written character) in an alphabetic system of writing, such as the Greek alphabet and its descendants. Letters compose phonemes and each phoneme represents a phone (sound) in the spoken form of the language. Letters also appear in abjads (alphabets with consonants only). Written signs in other writing systems are best called syllabograms (which denote a syllable) or logograms (which denote a word or phrase).

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