This is a handy list of symbols that can help a lot when laying down keyboard shortcuts on tutorials or README pages. The * marks symbols that are not commonly used; those keys are usually referred by their names or an abbreviation.
|^||Ctrl/Control (Mac notation)|
|⎈||Ctrl/Control (Unicode symbol)*|
|⌥||Option (Alt on Mac)|
|⌫||Delete (Backspace on Mac)|
|⊞||Win/Windows (Super on Windows)|
|⌘||Cmd/Command (Super on Mac)|