The TwistLock® connector was patented by the Harvey Hubbell company in 1938, (today, Welcome to Hubbell Wiring Device-Kellems). Because it is a locking connector, some prefer it to the stage pin connector. In the 1980s there was a (failed) movement to eliminate the stage pin connector and force all theaters, especially amateur and educational facilities, to convert.
Twistlock connectors come in a wide varieties on sizes, pin configurations, and voltages, based on a standardized system by NEMA. See this chart, which includes straight blade devices as well: https://www.hubbellnet.com/max_htm/tech_stuff/NEMA/front.html
See also Turn-Lock, for a competing product.
See also, NEMA.
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