What is meant by the word chuuRiyaaN which is the spiral-like carving around a screw... I can't remember how it is called in English...
It is "thread" in English. You are right that churiyan is also used for threads of a screw or of a machine, apart from its usual meaning of "bangles".
"A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread."
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