Single Crochet / Double Crochet

US terms: Single Crochet (sc)
UK terms: Double Crochet (dc)

Usually marked by a plus-shaped symbol + or the letter x.

How-to:

We insert the hook in the crochet piece and crochet the first stitch. We have two stitches on the hook and crochet them together, pulling on the thread of both at once. Now we have a single crochet stitch.

This requires two moves, which makes the single crochet stitch different from the slip stitch.