Does this sign mean what I think it means?

Saw this on one of the benches at the Rangers/Panthers game yesterday. Is the STFU exactly what I think it means? And if so do they do this for all of the ref crews?

Saw this on one of the benches at the Rangers/Panthers game yesterday. Is the STFU exactly what I think it means? And if so do they do this for all of the ref crews? Or is it a warning for refs that are particularly worth not pissing off? submitted by /u/Megamann87 [link] [comments]