vade mecum
noun/ˌvɑːdi ˈmeɪkəm/
/ˌvɑːdi ˈmeɪkəm/
(from Latin, formal)- a book or written guide which you keep with you all the time, because you find it helpfulWord Originearly 17th cent.: modern Latin, literally ‘go with me’.
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vade mecum