What is a back post treble crochet?

What does BP stand for in crochet?

Standard name: Back Post Crochet. Standard abbreviation: BP.

What does DCB mean in crochet?

Double Crochet behind the ch-1 sp (dcb):

Pull up a loop in that stitch. Your working yarn, hook, and all your loops should be behind the chain space. Finish your double crochet as normal.

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