How to properly read dimensions for a 3D printer?
Having the dimensions of your 3D printer ordered in Length x Width x Height is a common way, but nobody actually decided it.
I think it has something to do with the 3rd dimension being the "new" dimension for printing things, that's why it's appended at the end.
Additionally, the first axis on a 2D-coordinate system usually is the horizontal one, so writing Length x Width makes sense for me.
If you are unsure you can always test your printer (if you have one) by writing your own G-Code that moves the printhead on a defined axis.