Which of the following option do not specify a knuckle thread?

Which of the following option do not specify a knuckle thread? Correct Answer Transmits power in one direction only

Knuckle thread has a semi-circular profile of radius 1/4th of the pitch. Knuckle threads are suitably formed by molding as well as rolling and can be used in sheet metal covers for jars. But thread which can transmit power in one direction only is Buttress thread.

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Threads are classified into V thread, Acme thread, Knuckle thread, etc. on the basis of _________