Keyboard Layouts and Optin Keyboard Layout

Physical Layout: sizes
1. Character keys: 37 keys
2. Editing keys: 8 keys
3. Modifier/System keys: 9 keys
4. Number keys: 10 keys
5. Arrow keys: 4 keys
6. Function keys: 12 keys
7. Miscellaneous keys: 7 keys
8. Numpad keys: 17 keys
SUM: 104 keys

100% Standard size
1.-8.: 104 keys

80%/87% Tenkeyless
1.-7.: 87 keys

60%
1.-4/5: ~64 keys

40%
1.-3: ~54 keys