In US terms, this is a treble (tr).
How to do it:
- yarn over twice
- insert hook into stitch
- yarn over
- draw yarn through stitch (4 loops on hook)
- yarn over
- draw yarn through 2 loops on hook (3 loops left on hook)
- yarn over
- draw yarn through 2 loops on hook (2 loops left on hook)
- yarn over
- draw yarn through 2 loops on hook