How are numpad buttons named?

[Sibseven]

I tried KEY_0 and KEY_NUMERIC_0, but they didnt work. Different online key-testers recognized KEY_NUMERIC_0 as left-click. Remapping arrows did work.

[sabudum]

KEY_KP0, KEY_KP1, KEY_KP2, etc...
The same goes for math signs from the numpad:
KEY_KPPLUS, KEY_KPMINUS, KEY_KPASTERISK, etc...

You can get a full list of all button names with the command:
input-remapper-control --symbol-names

[Sibseven]

Thanks, will try