Crochet abbreviation BP stands for back post and is used with a type of stitch, such as BPdc or BPtr.
To make a back post stitch, you insert your hook from the back of your work, bring it around the post, and then return it to the back of your work. The way to remember how to make this stitch is that the hook ends up at the back of your work or that it brings a wrapped stitch to the back.
