MacOS

Cmd is the Command key. Alt or Opt is the Option key. Ctrl is the Control key, also shown as ‘^’ in shortcuts in the menu bar.

The thick, outlined up arrow is the Shift key.

The thin, left arrow or outlined pointer with ‘X’ inside is the Delete key, which deletes to the left. Pressing the Function key (Fn) and the Delete key deletes to the right.

The thin, right arrow key with a small vertical line at the end is the Tab key, which shifts the focus between some controls.