slipstitch

English

(2) A slipstitch can be used to create closed loops, such as the pegholes in these potholders.

From slip +‎ stitch.

slipstitch (plural slipstitches)

English Wikipedia has an article on:

Slip-stitch knitting

Wikipedia

(knitting) a kind of stitch that is passed from the left needle to the right needle without being knitted
(crocheting) a stitch used to connect different parts of a work, achieved by pulling the thread through two non-adjacent loops

knitting stitch

crocheting stitch