Assertion: option key | /r/HasAspect | many essential uses
Facets:
value: on the mac
type: LOCATION
value: to select boot partition
type: PURPOSE
Source sentences:
text: The Option key has many essential uses on the Mac; notably to select boot partition when starting the computer, and for direct printing of diacritical marks such as å, ß, ∂ and µ from the keyboard.