SO or so may refer to:
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by 2,798 kilometres (1,739 mi) of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Swaziland (Eswatini); and it surrounds the kingdom of Lesotho.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a socialist federation in Eurasia that existed from 1922 to 1991. Nominally a union of multiple national Soviet republics, its government and economy were highly centralized.
The Solar System is the gravitationally bound system of the planets and the Sun plus other objects that orbit it, either directly or indirectly.
Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia.
South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere.
Social media are computer-mediated technologies that facilitate the creation and sharing of information, ideas, career interests and other forms of expression via virtual communities and networks.
The Socialist Federal Republic of Yugoslavia (SFR Yugoslavia or SFRY) was a Balkan country governed by the League of Communists of Yugoslavia, that existed from its foundation in the aftermath of World War II until its dissolution in 1992 amid the Yugoslav Wars.