Large knight's move cap
This play of White's is too far away from the black stone to have much effect. When it is used, it is probably as a shallow reduction of a large framework, staying out of trouble.
This for example is from a pro game. With and White can make the game into a territory contest. Black cannot attack the capping stone severely.
Black may of course ignore White's play, or attack it from the side of the x points. Then White can start to make shape with and . Therefore this capping play is less innocuous than one might think; and has advantages over a two-space cap.