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If x is the horizontal axis and y is the vertical axis, then what do you call the z axis that is perpendicular to both x and y? The one that comes directly toward and away from you.

In other words,

width = horizontal

height = vertical

depth = ?

Please add any tags that fit.

Tom
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    As shocking asw it may sound, it is usually called "the $z$ - axis" ... sometimes it is also called "the vertical axis", but this depends on the point of view. – DonAntonio Apr 17 '16 at 17:49
  • The terms "horizontal" and "vertical" are used for the $xy$ plane. In 3D, these terms don't fit nicely anymore. In your case, the positive z-axis comes towards you (by the preferred Right Hand Rule), but back in High school, we learned to draw the y-axis horizontal, the z-axis vertical and the x-axis slanted towards us... – imranfat Apr 17 '16 at 17:51

2 Answers2

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The z-axis, is also sometimes known as.... the z-axis.

If you are drawing the axes as they are typically taught in school, the z-axis becomes the "height", the y-axis is "width" and I guess you could say that the x-axis becomes "depth" or "length"

q.Then
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It's called the Applical axis as it is used for many different applications, as in computer engineering the Applical axis is used as intensity when plotting two wave forms on a Cartesian plane and in physics it's used as depth.

Kram
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