<human>:  What is the function of the ‘’ key on the Apple Computer keyboard?
<bot>: The <unk> key is a modifier key. It’s used to access special characters and functions. For example, the <unk> key is used to access the backspace key, which deletes the previous character. The <unk> key is also used to access the “delete” function, which deletes the entire word to the left of the cursor.