A name for the Persian gulf that Persians get pissed off from if they catch you using it. But in reality, it's just a name. Nobody cares what anyone calls it.
In Arab states, they use that as the official name for the Persian Gulf. Most of the time though, they just say "Arabian Gulf" when speaking in Arabic and "Persian Gulf" when speaking in english. Even wikipedia does that.
Guy: I went to the Arabian gulf the other day.
Persian: OMG NOOO YOU ARE TRYING TO DESTROY MY CULTURE :((((