This is a Cross Treble Crochet st.
Row 1: Ch for desired length.
Row 2 -7: Yarn over (yo) twice, insert in 5th st from hook, *work off two loops, yo skip 2 sts, insert in next st and work off all loops on needle 2 at a time, ch 2, dc in center to complete cross. Yo twice, insert in next st and repeat from *. Tear off.