[Symbiote]

If America used metric paper, all these jokes could never have existed. The unexpected benefits of the traditional system.

PC_LOAD_A4 just isn't confusing enough.

LOAD_A4_PAPER or INSERT_A4_PAPER etc also fit within the limited length of the message.

[lostlogin]

“PAPER” would be enough to trigger some logical checks for most, surely?

I have done a stint of helpdesk work and can’t see that this would be too catastrophic.

[NikkiA]

"Paper Out" would be sufficient.

Yes, it'd cause the person to check every tray, but in my experience they do anyway.