You need some basic understanding of 2D graphics to understand what is X and Y. In fact, they are not good names otherwise because it is pretty easy to mix them up---one more reason to prefer left/right/top/bottom whenever possible. I've seen some codes using Column and Row instead of X and Y for that very reason. (Not to say that I like it.)
If you are okay with X and Y, you should probably have to accept that the definition of "commonly used", "well established" and "actual, proper" words is subjective and different areas and projects have different notions of them. I'm okay with `tk` if it is used consistently and doesn't interfere otherwise.
If you are okay with X and Y, you should probably have to accept that the definition of "commonly used", "well established" and "actual, proper" words is subjective and different areas and projects have different notions of them. I'm okay with `tk` if it is used consistently and doesn't interfere otherwise.