Here are the possible solutions for checking out clue
Answer
Clue
Relevancy
counterplotz
Clue
Passing out while checking out?
barcodes
Clue
They're scanned when checking out
Definition
BARCODE, an arrangement, readable by computer, of thick and thin parallel lines, e.g. printed on, and giving coded details of, goods at a point of sale, library books, etc.
