What does tapping one palm over the back of other hand mean in sign language?

There is no specific sign in American Sign Language (ASL) that involves tapping one palm over the back of the other hand. This gesture doesn't have a standardized meaning in ASL or other sign languages.

It's possible that the gesture you are referring to might be:

* A part of a different sign: Some signs in ASL involve a tapping motion, but they are combined with other handshapes and movements.

* A regional or personal sign: Some sign languages have regional variations, and individuals may develop personal signs.

* A gesture with a different meaning: The gesture might have a different meaning outside of sign language, like a way to signal attention or agreement in a specific context.

To understand the meaning of a gesture, it's crucial to consider the context and the individual using it.