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Thanks, I did not find the symbol, the book is from Mc Graw Hill, you do not have more documents to search by chance?

Hello community, I am new to this and I am looking for a specific symbol that I found in a book, the book is engineering, fluid mechanics, fundamentals and applications, is the image: I thank you if it is a special source or if it is a symbol created by the author, thank you very much in advance ...