Retractable sword
A retractable sword was a hand-held weapon, with a blade that could be retracted by pressing a button on the hilt. When sheathed, the blade was entirely contained within the hilt, making it small, compact and easy to carry. When released, the blade extended rapidly to a length of approximately one meter by unfolding in segments.

 owned a retractable sword and used it on the Naradas drill platform above  in 2258, to fight off a pair of Romulans. ()

Alternate reality
Hand-held weapons