Minecraft wiki entry for Coordinates, associated text: In commands, absolute world coordinates can be used, and each coordinate can alternatively be expressed as a relative world coordinate, written in tilde notation (~ΔX ~ΔY ~ΔZ). A number following a tilde (~) describes an offset from execution position along one of the world axes, and a lone tilde assumes an offset of 0. For example, the position 32 blocks SSW ~10 ~ ~-30 means "10 blocks east (+X) and 30 blocks north (–Z) of here." And ~ ~ ~ means the command's current position.