Double Treble / Triple Treble

US terms: Double Treble (dtr)
UK terms: Triple Treble (tr tr)

Usually marked by a T-shaped symbol with three crossbars on the stem.

How-to:

We yarn over the thread three times. We insert the hook in the crochet piece and crochet the first stitch. We have five stitches on the hook. We crochet the first two stitches together. We have four stitches on the hook. We crochet the first two stitches together. We have three stitches on the hook. We crochet the first two stitches together again. We have two stitches on the hook. We crochet them together and now have a double treble stitch.

If this is our first stitch in a row, we must remember to insert the hook in a stitch suitably far from the hook so as to gain the right height without misshaping the crochet piece.