Here is a handy chart to help you to convert UK crochet terms to US and vice versa. And I wrote a blog post about differences here: British vs. American Crochet Terms: What’s the Difference?
UK Terms | US Terms |
Double Crochet (dc) | Single Crochet (sc) |
Half Treble (htr) | Half Double Crochet (hdc) |
Treble (tr) | Double Crochet (dc) |
Double treble (dtr) | Treble (tr) |
Triple treble (ttr) | Double treble (dtr) |