The term 'keyboard key' refers to the various buttons on a computer keyboard that are used to perform different functions. The crossword solutions for this term include 'ENTER' (5 letters), 'ALT' (3 letters), 'backspace' (9 letters), 'TAB' (3 letters), 'spacer' (6 letters), 'DELETE' (6 letters), 'SHIFT' (5 letters), 'END' (3 letters), 'HOME' (4 letters), 'dee' (3 letters), 'del' (3 letters), 'esc' (3 letters), 'ctrl' (4 letters), and 'scrolllock' (10 letters). Each of these keys has a specific purpose, such as the ENTER key which is used to submit a command or the ALT key which is used to access menus. The backspace key is used to DELETE characters, the TAB key is used to move the cursor to the next field, the spacer key is used to add spaces between words, the DELETE key is used to DELETE entire words, the SHIFT key is used to capitalize letters, the END key is used to move the cursor to the END of a line, the HOME key is used to move the cursor to the beginning of a line, the dee key is used to DELETE characters to the right of the cursor, the del key is used to DELETE characters to the left of the cursor, the esc key is used to cancel a command, the ctrl key is used to access shortcuts, and the scrolllock key is used to lock the scrolling of text.