reftex-label
reftex-label is an interactive autoloaded Lisp function in `reftex-ref.el
'.
(reftex-label &optional ENVIRONMENT NO-INSERT)
Insert a unique label. Return the label.
If ENVIRONMENT is given, don't bother to find out yourself.
If NO-INSERT is non-nil, do not insert label into buffer.
With prefix arg, force to rescan document first.
When you are prompted to enter or confirm a label, and you reply with
just the prefix or an empty string, no label at all will be inserted.
A new label is also recorded into the label list.
This function is controlled by the settings of reftex-insert-label-flags.