Thank you so much!

So there is no more specific word? That is a little frustrating.

I am going to coin a few words that will make linguists cry as it will separate bits of the Greek but still have relevance:

Viewmonic: A visual reference to remember something important, specifically a visual clue to remind oneself of something that needs to be accomplished.

1: A specific landmark that is followed in directions. (e.g., :"After the large tree on the corner, take the third right".)

2: An item placed in an odd location as a reminder to do something specific. (e.g., "The large red bow wrapped around the door handle reminded them to get their lunch before leaving for work".)

Cuemonic: As above.