World Junior Championships

[ref18]

So i was watching the world junior championships today, and i noticed that the officials were wering some sort of white square on the back of their uniforms. I origionally thought is was their number, but after looking more closely, i saw an identical placard on the front of their jerseys, and it contained a logo of some kind, which i believed to be a commercial endorsement.

My big question was is that have officials become billboards, or was this some sort of crest issued by the governing body?