Cos, COS, CoS, coS or Cos. may refer to:
Costa Rica (/ˌkɒstə ˈriːkə/; Spanish: [ˈkosta ˈrika]; literally meaning "Rich Coast"), officially the Republic of Costa Rica (Spanish: República de Costa Rica), is a country in Central America, bordered by Nicaragua to the north, Panama to the southeast, the Pacific Ocean to the west, the Caribbean Sea to the east, and Ecuador to the south of Cocos Island.
Cosmetics, also known as make-up, are substances or products used to enhance or alter the appearance or fragrance of the body.
Costco Wholesale Corporation is the largest American membership-only warehouse club that provides a wide selection of merchandise, and as of 2015, was the second largest retailer in the world after Walmart.
The cosmic microwave background (CMB) is the electromagnetic radiation left over from the time of recombination in Big Bang cosmology.
Cossacks (Ukrainian: козаки́, koza'ky, Russian: казаки́, kaza'ki, Polish: kozacy) are a group of predominantly East Slavic-speaking people who became known as members of democratic, self-governing, semi-military communities, predominantly located in Ukraine and in Russia.
Cosmic rays are high-energy radiation, mainly originating outside the Solar System. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface.
The Italian cruise ship Costa Concordia capsized and sank after striking an underwater rock obstruction off Isola del Giglio, Tuscany, on 13 January 2012, with the loss of 33 lives.
In electrical power generation, the distinct ways of generating electricity incur significantly different costs.