These handshape primes found in ASL (American Sign Language) are the smallest units of language (ASL). This set of handshape primes is called "handshape paramater".
A single ASL word/sign is made up of these five parameters: handshape, movement, location, palm orientation, and non-manual marker. Each parameter has a number of primes. E.g. there are over 45 handshape primes.
The sign language handshape chart is organized into categories from "O" to "10" using the Lapiak/Handspeak categorization system. Each handshape prime contains digits from ASLwrite and and si5s.
Introducing ASL writing. ASL Writing Dictionary