aide-memoire
/ˌeɪdmemˈwɑːr, 〈法〉 ɛd mɛmwaʀ/noun
(pl. aides-memoire或aides-memoire. 读音同)
1- an aid to the memory, especially a book or document帮助记忆的东西（尤指书、文件）。
1.1
- an informal diplomatic message备忘录（非正式的外交文电）。
词源
mid 19th cent.: from French aide-mémoire, from aider 'to help' and mémoire 'memory'.