SO or so may refer to:
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded on the south by 2,798 kilometres (1,739 mi) of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans; on the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and on the east and northeast by Mozambique and Swaziland; and surrounds the kingdom of Lesotho.
The Solar System is the gravitationally-bound system comprising the Sun and the objects that orbit it, either directly or indirectly.
Socialism is a range of economic and social systems characterised by social ownership and democratic control of the means of production, as well as the political ideologies, theories, and movements that aim to establish them.
South America is a continent located in the western hemisphere, mostly in the southern hemisphere, with a relatively small portion in the northern hemisphere.
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.
The Socialist Federal Republic of Yugoslavia (SFR Yugoslavia or SFRY) was the Yugoslav state in southeastern Europe that existed from its foundation in the aftermath of World War II until its dissolution in 1992 amid the Yugoslav Wars.
Sony Corporation (ソニー株式会社, Sonī Kabushiki Kaisha, ) (often referred to simply as Sony) is a Japanese multinational conglomerate corporation headquartered in Kōnan, Minato, Tokyo.