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this might be irrelevant question but what does cs mean in macros like \csname and \endcsname

This is my first question on SE, sorry for any mistakes i do, please correct me. Thanks

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The cs in \csname...\endcsname stands for control sequence.

You'll find some original reference to this definition in The TeXbook (Chapter 3 Controlling TeX, p 7):

Immediately after typing '\' (i.e., immediately after an escape character) you type a coded command telling TeX what you have in mind. Such commands are called control sequences.

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