Final answer:
The ASL "Rule of 9" refers to signing ages 1 through 9, with numbers 1-5 shown with fingers, while for 6-9, the respective number handshape is combined with the sign for 'age' moving in an arc from the forehead.
Step-by-step explanation:
The "Rule of 9" in American Sign Language (ASL) pertains to signing ages from one to nine. For numbers one through five, the age is signed by holding up the corresponding number of fingers on one hand. Starting with the number six through nine, you combine the number handshape with the ASL sign for 'age.' So, for these ages, you form the handshape for the number (6, 7, 8, or 9), and then move it in a small arc outward from the forehead. This combines the sign for the number with the contextual sign that indicates 'years old' or 'age.' It's important to note that beyond the age of nine, ages are signed differently, without usage of the "Rule of 9."