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What your example is referring to is the change in the glutamic acid (E) amino acid (AA) residue, which is in position 36. This is denoted so that people/scientist would know what has been changed and usually there should be another letter after that number such as Y, which is tyrosine, to denote what it has been changed to, if it is a substitution. Then there is the delta (∆) symbol to denote deletion, and usually a number range e.g. 36-50 or just a number e.g. 70 appears after it to denote if a protein has been truncated in a certain AA range or if the entire protein from that AA is truncated, respectively. These are just some conventions, which isn't documented very well and you just figure them out when reading a few papers but I would welcome any edits for a good source for protein change annotations.