Okappiki refer to unofficial collaborators who played a marginal role in police functions such as town magistrate's offices and Hitsuke tozoku aratame-kata (literally, "investigative division for arson and organized robbery") in the Edo period.
岡っ引(おかっぴき)は、江戸時代の町奉行所や火付盗賊改方等の警察機能の末端を担った非公認の協力者。