Definition - A character or symbol that is used as shorthand for a word.

Example -
The @ symbol when used to represent the word at.

Etymology -
The term was coined from the Greek phone, voice or sound + gram, that which is written, and was probably based on the analogy of the word telegram.

Oxford English Dictionary -
Its first citation is from 1860:
"Phonogram, a written letter or mark, indicating a certain sound, or modification of sound; as —k, ·ah."
(I. Pitman Man. Phonography (ed. 10) §17. 21)

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