The Ibanez GRG270B is a GIORG series electric guitar model introduced in 2004. Features include a basswood body, Ibanez made Powersound pickups and a double locking tremolo.
The B in the model number supposedly stands for 'black hardware', although that's not a unique feature of the GRG270B. It might also be an 'undefined' suffix to differ it from the very similar GRG270.