This one is called Treble Crochet abbreviated as tr in US terminology and can also be referred to as Triple Crochet.
EDIT: My stitch tutorials work into the back loop. For more information check out this post
Double Treble abbreviated as dtr in UK terminology.
Start off with a foundation chain.
Wrap the yarn around hook twice, from back to front, and skip 4 chains (sometimes called 5th chain from hook)
(If you remember all your other stitches single/double skips one, half double/half treble skips two, and double/treble skips three)
push hook through chain, you will now have four loops on hook
yarn over, from back to front and pull through first chain on hook.
Again, four chains on hook.
yarn over again and pull through the first two loops on hooks
three loops on hook.
yarn over hook (back to front) and pull through next two loops
two loops left on hook.
yarn over again and pull through last two loops
Stitch is complete when one loop is left
repeat into each chain
Yarn over hook twice, hook through chain, yarn over and through first loop,
yarn over and through 2 loops three times in total.
One finished row.
Now for the turning chain:
4 chains, which count as first stitch
Treble/double treble into next chain
Make sure you complete the row! At first glance you may think this row is completed, but one more stitch is needed!
3 rows of 8 stitches completed.