How to search for stuff in Emacs?

To search for information within Emacs you can use the help system. The following three options are:

• search the variable: C-h v "search-string"
• search symbol inside the help section: C-h S "search-string"
• search inside the info global section: C-h i g "search-string"

Have you asked Emacs? C-h v translation-table-for-input gives you a summary, and C-h S translation-table-for-input takes you to the info node C-h i g (elisp)Translation of Characters which tells you more about translation tables. source Stack Overflow