What does USR stand for?

[Yeahbuddy42]

Pardon me..

What does USR stand for. I am at a loss.

[eldargal]

Universal Special Rule. The special rules listed in the BRB basically, those that are universal rather than specific to certain armies.

[Wolfshade]

BRB - Big Rule Book (and others...)

[Psychosplodge]

USR- Unexpected sudden randomness, it's to do with the new terrain rules.