However, you can sign it in a couple of ways:
1. Using the sign for "cake" and then adding a sign for "pie" (a "p" shape with the hand moving like you're slicing a pie):
* Sign "cake" (a "c" shape with the hand moving like you're cutting a cake)
* Then, make a "p" shape with your hand and move it back and forth, simulating slicing a pie.
2. Signing the individual components of a pie:
* You could sign "fruit" or "apple" (depending on the type of pie)
* Then sign "crust"
Ultimately, how you sign "pie" depends on the context and your preference.