- (bos) wild and domestic cattle; in some classifications placed in the subfamily Bovinae or tribe Bovini
- .bo is the Internet country code top-level domain (ccTLD) for Bolivia. It is administered by ADSIB, As of September 2008, the NIC was offering a registration fee of about 40 $US per year or 280 $Bs for third-level domain and 200 $US per year or 1520 $Bs for second level domain. ...
- Debian is a computer operating system composed of software packages released as free and open source software especially under the GNU General Public License and other free software licenses. ...
- Bo, also known as Bo Obama, (born October 9, 2008) is the pet dog of the Obama family, the First Family of the United States. Bo is a neutered male Portuguese Water Dog, or Portie. ...
- Bo is a 2010 Belgian film directed by Hans Herbots and is based on the novel Het engelenhuis by the Belgian author Dirk Bracke. ...
- Bo is a Swedish/Danish masculine given name, derived from an Old Norse nickname, bua, meaning "to live". A variant of Bo is the Swedish Bosse. Bo is uncommon as a surname. Bo can be short for Bonita or Bonnie.
- Aka-Bo or Bo is an extinct Great Andamanese language, of the Northern group. It was spoken on the west central coast of North AndamanRadcliffe-Brown, Alfred R. (1922). The Andaman Islanders. Cambridge: Cambridge University Press. and on North Reef Island of the Andaman Islands in India. ...
- A quarterstaff, especially in an oriental context
- A male given name in occasional use since the 1970s
- (Bos) a taxonomic genus, within subfamily Bovinae - the cattle
- (BOS) Best of Opposite Sex
- (BOS) battlefield operating system
- (BOS) British Orthodontic Society
- (BOS) Southern Opposition Bloc, Bloque Opositor del Sur. Anti-Sandinista political group led by Alfredo Cesar. Founded in Costa Rica in 1985. Joined with UNO to form the RN in 1987.
- (BOS) [BSG] Bootload Operating System. A minimal, single-user, single-processor, non-paged, entirely assembly language 645/6180 "operating system" that was run before Multics came up and after it was shut down or crashed. ...
- (BOS) leather wine container
- (BoS) The Brotherhood of the Shadows; criminal clan dedicated to the harassment and termination of the dominion.
- (The BoS) Our buyer(s) of size. They first showed up in late August 2010 and have since provided a near-daily bid for both gold and silver. The BoS have been particularly active in the silver pit.
- A long stick, similar to the english long staff but spelt differently
- A fighting staff, about 6 feet long and 1 inch in diameter, made of polished wood and used in several martial arts.
- On a graph, the slope that occurs when concentration is plotted against the drug half life (or C is plotted against t).
- British Orienteering. A new name for BOF with a somewhat unfortunate acronym, which we are not supposed to use.
- The codename for Debian 1.3, release date: 1997
- bind(ing) off (also known as cast[ing] off)
- Box Office. The amount of money grossed by a film, either with reference to a particular time frame or to date (for BO information, click here).