Definition: a numeral, 7, VII, etc, representing this number.
Signed at age 6;11. The numbers seven and eight are marked handshapes which are two of the last handshapes to acquire in children. Proximilization: sometimes they pronounce it incorrectly (7 vs 8) even if they know the right answer in their mind. The 7/8 handshapes are usually mastered by about age 8 (the similar ending timeline as the phonological acquisition in vocal-aural modality).