Memo (noun)

1. A short message or note, typically written or printed, that is used for internal communication within an organization.
2. A written or printed message, typically a reminder or instruction, that is sent or given to someone within an organization or a company.

Origin:

Short for memorandum, from latin memorandum est it must be remembered.

Examples:

1. She sent a memo to the team outlining the new policy.
2. He wrote a memo to the manager requesting a meeting.
3. The memo was circulated among the employees.
4. The memo reminded the staff of the upcoming deadline.
5. The memo included instructions on how to use the new software.