NEMA L14-30P. L = twist lock, P = plug, 14 = with neutral and ground, 30 = 30 amps.
Your picture shows a male end (P for plug), which would typically be a power input like what you'd use to connect a generator to a house. The circuit breaker for this receptacle likely has a transfer switch lock-out bar on it so that it can't be energized when the panel main is energized. This won't do you any good for car charging.
To charge an EV, you need a female receptacle (R) that's connected to the circuit breaker panel in the typical fashion (not configured for a generator power input).