101 is a short form of basic introduction. This introduction comprises of the introductory material in a course of study. The term 101 is used as a palindromic prime number where by it remains the same even if you write it backwards.
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what is the meaning of 101
comprising the introductory material in or as if in a course of study (used postpositively): Economics 101; Life 101; It's Jungle 101 on a trip up the Amazon.