upcase-word

upcase-word is an interactive built-in function in `C source code'.

It is bound to M-u.

(upcase-word ARG)

Convert to upper case from point to end of word, moving over.

If point is in the middle of a word, the part of that word before point
is ignored when moving forward.

With negative argument, convert previous words but do not move.
See also `capitalize-word'.