One more generally used electrical outlet in U.S. is definitely the 20A 120V outlet. The receptacle seems to be a bit various within the 15A outlet with a small horizontal slot branching of the vertical slot. Also, the 20A outlet employs a twelve-gauge or 10-gauge wire with a 20A breaker. https://types-of-electrical-plugs34443.pages10.com/5-simple-statements-about-types-of-plug-tops-explained-64982804