Answer: reminder

AnswerCrossword Clue
REMINDERMemo
reminderA message or communication designed to ensure that someone remembers something
reminderA letter sent to remind someone of an obligation, esp. to pay a bill
reminderone that reminds (to cause to remember)
reminderA thing that causes someone to remember something
REMINDERSouvenir, e.g.
REMINDERPost-it Note, perhaps
REMINDERFinger string e.g.
REMINDERMemory aid
REMINDERPrompt
REMINDERNote on the fridge, maybe
REMINDERString on the finger, e.g.
REMINDERMemory-jogger
REMINDERMnemonic
REMINDERMnemonic device
REMINDERString on a finger, e.g.
REMINDERString around the finger.
REMINDERThe string around one's finger.
REMINDERString on finger.
REMINDERMemo of future action.
REMINDERNote to keep
REMINDERString around the finger
REMINDERString on finger, perhaps
REMINDERTo-do list item, say
REMINDERBrain tickler
REMINDERNote to self
REMINDEROnline calendar pop-up
REMINDERString around a finger
REMINDERHint