Here are the possible solutions for initials seen at checkout lines clue
Answer
Clue
Relevancy
ncr
Clue
Initials seen at checkout lines
Initials seen at a checkout counter
barcodes
Clue
Checkout lines?
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.