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
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