Crochet: BPdc (back post double crochet)

A BPdc (Back Post Double Crochet) is a textured crochet stitch that’s worked around the post of a stitch — from the back to the front and then to the back again — instead of into the top loops as usual.

It’s often used to create ribbing, raised textures, or 3D patterns (like cables and waffle stitches).