In crocheting, "2x ss" typically stands for "2 double slip stitches." It indicates that you should make two slip stitches in the designated stitch or space. This technique is often used to create a smooth transition or to join rounds in a project. Slip stitches are worked by inserting the hook into a stitch, pulling up a loop, and then pulling that loop through the loop already on the hook.
Slip Stitch
I would say most likely that means "slip stitch."
hdc stands for half double crochet
SuperSport
Super Sport (SS)
In the case of ships SS stands for steamship.
Foundation chain. This is the first group of chains that you make at the start of a project.
Schutzstaffel (Protection Unit)
Stainless steel
lightning bolt
I would say most likely that means "slip stitch."
SS stands for scout sniper