Which Letter Do You Prefer For The Up Direction?

Nothing starts a fistfight in a physics department faster than asking which axis points up. The Z-axis gang is living their best life with the standard right-hand rule from intro physics. The Y-axis people are crying because they're stuck in some weird coordinate system limbo—probably from doing too much 2D graphing where y naturally goes vertical. But the X-axis psychopaths? They're not even invited to the party anymore. They've probably rotated their entire worldview by 90 degrees and are doing calculations in some cursed reference frame that makes everyone else uncomfortable.

Fun fact: In most 3D modeling software and game engines, Z points up, but in traditional mathematics and many engineering applications, Y points up. This inconsistency has caused more confusion than the time someone tried to explain why we use i, j, k instead of x, y, z for unit vectors. Pick your poison and prepare to defend it with your life at your next research meeting.