The word abscissions can be signed by using the ASL sign for "cut" with both hands, starting at the base of the fingers and pulling outward as if cutting something.
To sign the word "abscissin," use both hands to make a "C" shape with your fingers and twist them in opposite directions while moving them horizontally away from each other.
The word "abscissa" can be signed by using the ASL (American Sign Language) letter "a" handshape and tracing a horizontal line in front of your body from left to right.
as "To sign the word abscissas, use handshapes to represent the letters A-B-S-C-I-S-S-A-S in American Sign Language or use the fingerspelling alphabet to spell out the word."