tab-to-tab-stop

tab-to-tab-stop is an interactive compiled Lisp function in `indent.el'.

It is bound to M-i.

(tab-to-tab-stop)

Insert spaces or tabs to next defined tab-stop column.
The variable `tab-stop-list' is a list of columns at which there are tab stops.
Use M-x edit-tab-stops to edit them interactively.