When I of speak of direction, I'm speaking about our perception relative to the earth. We all intuitively know about all three directions. For instance, if we throw a ball, it is moving constantly forward, and simultaneously moves up and then down, but never left or right. What I need however, is a technical term for all three directions.
To add some context, I are studying the auditory system, and I need a shorthand term for each direction. Unfortunately, it seems that length/width are used interchangeably, with only height being used consistently. I want to work with the terms horizontal/vertical, but there's no term I can find to describe the z axis. Furthermore, from what I've read, many people define the horizontal direction as being the horizontal and vertical direction, with height being described as the vertical direction i.e, horizontal = area, vertical = height.
The thing is though is that everyone knows what left and right, backwards and forwards, and up and down are, everyone, and this I believe is because these directions relate to our own perception (rather than an objects).
So right now as far as my nomenclature, it's a huge mess. It would be so nice if there is a single word that describes each of these three directions without ambiguity.