It's looking for operators. That string encodes the operator to look for, and the values of tokl and tokc that will be used if that operator is found.

The first entry looks for "++", and if found sets tokc to 1 ('#' - 'b' + 64) and tokl to 11 ('m' - 'b').

The second entry looks for "--" and if found sets tokc to 255 and tokl to 11.

The third entry looks for "*" and if found sets tokc to 12693263 and tokl to 1. (12693263 is 0xc1af0f, which is an x86 IMUL instruction).