What does OTB stand for?

Office Track Betting (SAUS)

Off the Board - Investment term

Off to Bed - Internet lingo (CHAT)

Off Track Betting (EFIS)

Off-Track Betting

Old Tired Broads

On the Bow - Nautical

Open to Buy

Operations Training Branch (SAUS)

Orbiting Tanker Base - NASA (NASA)

Ordnance and Terminal Ballistics

Ortho-Toluidine Boric Acid - Organic chemistry

Outstanding Trace Buffer

Oval Fat Body (SAUS)

Overseas Trust Bank - Hong Kong

Oxide Titanium Bronze (ODA)

Waverly Resource Library, Thunder Bay Public Library, Ontario - Library symbol - National Library of Canada (NLC)

October (CDAI)