Related Clues:

• Checkout facilitator
• Register reading
• They're scanned in supermarkets
• Stock control patterns
• Stock control pattern
• Lines in stores
• 'Howl!' — poem recited as a series of lines
• Scanner targets
• They run parallel in a grocery store
• Bars for checking people out
• Scanned ID at a supermarket
• Filling displays, fish shops may use these
• Machine-readable code for retail purposes