isearch-forward-symbol-at-point

isearch-forward-symbol-at-point is an interactive compiled Lisp function in `isearch.el'.

It is bound to M-s ..

(isearch-forward-symbol-at-point)

Do incremental search forward for a symbol found near point.
Like ordinary incremental search except that the symbol found at point
is added to the search string initially as a regexp surrounded
by symbol boundary constructs \_< and \_>.
See the command `isearch-forward-symbol' for more information.