There is no specific sign in ASL that represents "apple" as a symbol. The sign for "apple" is made by forming a fist with the dominant hand and touching it to the chin, then bringing the hand down and opening it slightly, as if taking a bite.
It's important to remember that ASL is a visual language, and the meaning of signs can sometimes be context dependent. While there is no specific symbolic sign for "apple", it's possible that some individuals or communities may use specific gestures or signs that represent "apple" for them.