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 Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union, 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 Sun and the objects that orbit it, either directly or indirectly, including the eight planets and five dwarf planets as defined by the International Astronomical Union (IAU).
Solo: A Star Wars Story (or simply Solo) is a 2018 American space Western film based on the Star Wars character Han Solo.
Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of Japan and China, east of India, west of Papua 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.