Answer: mentalnote

AnswerCrossword Clue
MENTALNOTE

It's not written down

MENTALNOTE

Unwritten reminder

MENTALNOTE

Memory aid, of a sort

MENTALNOTE
Thing to make when a Post-it isn't handy
MENTALNOTE
Reminder to oneself
MENTALNOTEInternal memo?
MENTALNOTEAn unwritten reminder.
MENTALNOTEIt's not jotted down
MENTALNOTEMind memo
MENTALNOTEImaginary string around the finger
MENTALNOTERecall source