Short answer: it means exclusive-or.
For the teaching tools, we need some simple writing of the formulas. As you can read on https://es.cs.uni-kl.de/tools/teaching, we use
for negation, conjunction, exclusive-or, disjunction, implication, and equivalence (with decreasing precedences in this order).
Alternatively, you may use the characters ¬,∧,⊕,∨,→, and ↔, but you may have hard times to find out how to type these. Yet another alternative would be to write operators in words: not,and,xor,or,imp,eqv (teaching tools accept all the three versions).