Look at the front of the book for a legend or rubric for symbols. It may refer to pricing group, type of materials and so on.
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the 5th letter of the greek alphabet (aka e in english)
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. Assuming that you mean d~(e~f) = (d~e)~f where ~ is a binary operation, it is the associative property.
No.
Each number represents the count of letter is each word, as in I=1 letter L-O-V-E=4 letter Y-O-U=3 letter. So therefore 143 would mean, "I love you"
E