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𝠀	U+1D800, 𝠀 SIGNWRITING HAND-FIST INDEX

American Sign Language

From the use of the index finger as the first extended one when counting by hand in American culture.^[1]

This one-handed ASL sign is produced as follows:
1. Posture the dominant hand in the “1” handshape about half an arm’s length in front of the shoulder, dominant palm facing back.
2. Hold the hand briefly in this posture.

(ASL gloss: ONE)

Some people always sign the number 1 with the palm forward. For others, however, the palm faces back (i.e., as 1@Side-PalmBack) for the actual number 1 but the palm faces forward when used as a part of a longer number like 555-1234, as a time (i.e. one o'clock), and in certain other numeral-incorporating constructs.
Like other single-digit ASL numerals, this sign is incorporated into several other signs to indicate a single instance. Several of the derived terms below show that numeral incorporation.

^ Emily Shaw, Yves Delaporte (2015) A historical and etymological dictionary of American Sign Language: the origin and evolution of more than 500 signs, Washington, DC: Gallaudet University Press, →ISBN, →OCLC, page 239