Perhaps it stands for "Off Track Betting"?

I was this on the side of a bin outside a home undergoing renovations. I immediately wondered what OTB stood for. Off Track Betting? Open to Buy? Over the Bars?

The company's name, OTB, means nothing to me. I looked on the firm's website and could not find any hint about ht the firm had ended up with OTB as its name. I guess that OTB might be the initials of the founders. But the name does not really say anything to me as a potential customer. I wonder why OTB has hung onto the name?

Is it hurting the firm's business? Probably not, but I can't see it helping very much either.