Or

Takes the two top values on the boolean stack and or's them together. If either or both are true, it results in true being placed on the boolean stack. If both are false it will place a false on the boolean stack.

false false or     puts false on the stack
true false or      puts true on the stack
false true or      puts true on the stack
true true or       puts true on the stack

Logic: true false and or not xor