UK / US crochet term:
Chain stitch – ch
Double crochet / Single crochet – dc/sc
Double treble – Treble – d.tr / tr
Stitch – st
Long treble / long double crochet – L.tr/L.dc: yarn over, insert the hook into the stitch, yarn over, draw up a long loop. The loop should be roughly the same size as 5 chains.