Related Clues:

• Post-it, e.g.
• Brief communication
• Post-it message
• Do, for example
• Memorandum
• Memory jogger
• Nielsen number
• A security
• Do, re or mi
• Semiquaver, e.g.
• Do on a scale
• A,B,C or D
• Record, in a way
• Signify
• One on a staff