What is Vim's feature name for this: # vim:sw=4:ts=4:et:

Question

Even after 20 years with Vim, I keep forgetting name for the Vim feature where the editor picks up config statements from a comment at the beginning (or I think end) of a file:<

Answer 1

:h 'ts (i.e. :help 'tabstop') will bring up a detailed explanation of how to use et, ts, and sw as well as giving a pointer to modeline (modeline is the option that is in question).