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"signature" is also used as a crossword clue. If that's what you saw, the answer is often autograph (9 letters).
Definitions
a distinguishing style
Word origin
Borrowed from Middle French signature, or from Medieval Latin signātūra, future active periphrastic of verb signāre from signum (“sign”), + -tūra, feminine of -tūrus, future active periphrastic suffix. Displaced native Old English handseten (literally “hand setting”).
Used in a sentence
“IN COMMENTS during signature of the bill yesterday during “Agriculture Day” at the Illinois State Fair in Springfield, Thompson agreed with farmers that land needs to be protected.”
“the natural and indelible signature of God, which human souls […] are supposed to be stamped with”
“The TACOM Vehicle Signature Reduction program is concerned with reducing the noise signature detectability of military vehicles in combat.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer3 curated clues
01“Distinctive mark”9 letters
02“Name written by hand”9 letters
03“Signed name”9 letters
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