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The Collaborative International Dictionary
Idiograph

Idiograph \Id"i*o*graph\ ([i^]d"[i^]*[-o]*gr[.a]f), n. [Gr. ? autographic; 'i`dios one's own + gra`fein to write.] A mark or signature peculiar to an individual; a trade-mark.

Wiktionary
idiograph

n. A mark or signature peculiar to an individual.