Body-relative direction

A non-flopped image of a right-handed Cartesian coordinate system, illustrating the x (left to right), y (backward to forward) and z (down to up) coordinate axes relative to a human being

Body-relative directions (also known as relative directions or egocentric coordinates) are geometrical directions relative to an object such as a person's body or a road sign.

The most common ones are: left and right; backward (or posterior) and forward (or anterior); down (or inferior) and up (or superior). These six directions form three pairs of orthogonal coordinate axes, often given as a right-handed coordinate system as (left→right, backward→forward, down→up).

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