What is the mathematical symbol and what does it stand for

Logical operators in Discrete Mathematics
∨ is a disjunctive symbol
Λ is a conjunction sign
If there are two propositions P and Q, if and only if P and Q are f at the same time, the true value of P ∨ q is f, otherwise T; if and only if P and Q are t at the same time, P ∧ q is t, in other cases, the true value of P ∧ q is f
Then, disjunctive ∨ can be interpreted as "concurrent or" and conjunction ∧ can be interpreted as "and"

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