aide-mémoire

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A memorandum setting forth the major points of a proposed discussion or agreement, used especially in diplomatic communications.
• noun Something, such as a mnemonic device, that serves as an aid to memory.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A memory-aid; a reminder or memorandum, especially a book or document serving this purpose.
• noun diplomacy a general term for a document circulated in a meeting or summit for discussion purposes (also termed a non-paper)