Final answer:
A memo or memorandum is a communication tool in business with a single addressee, which can be action-oriented or informational.
Step-by-step explanation:
The item in question that has only one addressee and is directed either as an action (TO) or for information (INFO) is typically referred to as a memo or memorandum. This term is often used in business or organizational communication to convey messages internally. A memo intended for action requests the recipient to perform a specific task, while an informational memo provides the recipient with certain details or data, without requiring immediate action.