Here is the Notation appendix from my LA book
https://minireference.com/static/excerpts/notation_appendix.... for your reference, and another excerpt with basic info about about using set notation
https://minireference.com/static/excerpts/set_notation.pdfIf you plan to read the book by Guruswami, Rudra1, and Sudan you should consult their notation:
https://cse.buffalo.edu/faculty/atri/courses/coding-theory/b...
For most types of symbols you can figure out what they mean intuitively, but these two are really important, and not obvious at all:
(n,k,d) ≝ code with block length n, dimension k, distance d
[n,k,d] ≝ a linear code with block length n, dimension k, distance d