Here's a list of the button IDs:
https://autohotkey.com/docs/KeyList.htm
In that list you'll find:
LWin Left Windows logo key. Corresponds to the <# hotkey prefix.
RWin Right Windows logo key. Corresponds to the ># hotkey prefix.
Note: Unlike Control/Alt/Shift, there is no generic/neutral "Win" key because the OS does not support it. However, hotkeys with the # modifier can be triggered by either Win key.
Control (or Ctrl) Control key. As a hotkey (Control:

it fires upon release unless it has the tilde prefix. Corresponds to the ^ hotkey prefix.
Alt Alt key. As a hotkey (Alt:

it fires upon release unless it has the tilde prefix. Corresponds to the ! hotkey prefix.
Shift Shift key. As a hotkey (Shift:

it fires upon release unless it has the tilde prefix. Corresponds to the + hotkey prefix.
LControl (or LCtrl) Left Control key. Corresponds to the <^ hotkey prefix.
RControl (or RCtrl) Right Control key. Corresponds to the >^ hotkey prefix.
LShift Left Shift key. Corresponds to the <+ hotkey prefix.
RShift Right Shift key. Corresponds to the >+ hotkey prefix.
LAlt Left Alt key. Corresponds to the <! hotkey prefix.
RAlt Right Alt key. Corresponds to the >! hotkey prefix.
Note: If your keyboard layout has AltGr instead of RAlt, you can probably use it as a hotkey prefix via <^>! as described here. In addition, LControl & RAlt:: would make AltGr itself into a hotkey.