Milnor's book notation (smooth structure) and its up to date

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What exactly is the notation of smooth structure in Milnor's book and how to pronounce it? What is its up to date (equivalence) notation?

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This community wiki solution is intended to clear the question from the unanswered queue.

The smoothness structure is certainly denoted by some version of an "S". See the comments, especially that of s.harp. It is pronounced as "S".

Since the letter is handwritten, it does not make sense to associate a definite font as available in Latex or MathJax.