noun
Option key
Refers specifically to the Option key on Apple Macintosh keyboards. In computing contexts.
Macで特殊文字を入力するには、オプションキーを押しながら別のキーを押します。
To type special characters on a Mac, press the Option key together with another key.
Variant with interpunct, sometimes used for clarity.
Borrowed from English 'Option key', referring to the key on Apple keyboards.