Chinese: 直四 (zhi2 si4)
Japanese: 直四 (chokushi)
A big eye of four in a row makes a group alive. The points a and b are miai: if White plays one, Black plays the other in order to make two eyes.
Whether the position is in the corner or not makes no difference at all, though in the example it is in the corner.
Straight Four, Bent Four, Twisted Four - Comments