i don't really understand what Gamma means in computer logic, My prof gave me this as context *Suppose that is a set of (Boolean)...

i don't really understand what Gamma "Γ" means in computer logic, My prof gave me this as context

*Suppose that Γ is a set of (Boolean) formulas A and B are two (Boolean) formulas.*

I still dont understand what Gamma is though for this question, could someone give me context?