A memo is a short written message, often used in business settings, to communicate important information or instructions to a specific group of people. Full definition
One question I still have is what about memo pad? (berryreview.com)
If you're donating in honor of someone, sponsoring a pet or want to direct your donation to our operating costs, please write that in memo of your check. (wheelingsuperheroes.org)
How about when someone with a clue released an internal memo from API that they were developing «curriculum» to cast doubt on climate change? (globalwarming.org)