callbackhandle
nounUK /ˈkɔːlbækˌhændl/
US /ˈkɔːlbækˌhændəl/
A callback handle is a special name you save so you can call a helper back later.
The program kept a callback handle so it could ring the helper when the timer finished.
OTHER MEANINGS
2. In programming, a value that identifies a registered callback so it can be invoked or removed later.
Store the callback handle and pass it to removeListener when you no longer need updates.
3. A reference returned when you register a callback, used to cancel or manage it.
The library returns a callback handle you can use to unsubscribe from the feed.
4. A nickname for a saved function reference used to respond to an event.
Keep the callback handle in a variable so the button click can find it.