I'm still new to Airsoft myself I honestly thought it was a "universal term" however I think you are correct. I spoke to a few people and where I play (The Grange) in Coventry they use it to identify by using a single band of tape or double band on the rif.
Thinking it was a universal term across the board I was going to ask what makes something single or double band. Now I know I'll get a more clear answer from the sight haha.
Thank yourself and everyone else that commented, even if I did confuse some of you