SAO or Sao may refer to:

• The Session-At-Once recording mode for optical discs. In Optical disc authoring, there are multiple modes for recording including Disc-At-Once, Track-At-Once, and Session-At-Once.
• The Smithsonian Astrophysical Observatory of the Smithsonian Institution in Cambridge, Massachusetts
• The Smithsonian Astrophysical Observatory Star Catalog
• The Special Astrophysical Observatory of the Russian Academy of Sciences, the site of the BTA-6 Telescope, which for many years was the world's largest telescope
• Security Advisory Opinion, a decision-making process used by US Department of State and United States embassies to grant or deny United States visas
• Sao, Burkina Faso
• The Sao civilisation who lived south of Lake Chad
• The Sáo, a bamboo transverse flute used in Vietnam
• Sao (moon) of Neptune
• Sao, one of the Nereids
• São is the Portuguese word for saint. The Smithsonian Astrophysical Observatory (SAO is a "research institute" of the Smithsonian Institution headquartered in Cambridge Massachusetts, The Smithsonian Institution (smɪθsoʊnɪən is an educational and research institute and associated Museum complex administered and funded by the Government of Cambridge Massachusetts is a City in the Greater Boston area of Massachusetts, United States. The Smithsonian Astrophysical Observatory Star Catalog is an astrometric Star catalogue. The Special Astrophysical Observatory (Специальная Астрофизическая Обсерватория or SAO RAS for short is an astronomical Observatory The Russian Academy of Sciences (Российская Академия Наук Rossi'iskaya Akade'miya Nau'k, shortened to PAH RAN) consists of the National Security Advisory Opinion ( SAO) or Washington Special Clearance, commonly called security clearance, administrative clearance, or administrative A diplomatic mission is a group of people from one State or an international Inter-governmental organization (such as the United Nations) present in United States Visas are used by millions of foreign nationals visiting the United States every year The Sao or So were an African civilisation that flourished from ca The sáo (also called sáo trúc) is a small Transverse flute used in the traditional music of Vietnam. Sao (, or as in Greek Σαώ is a prograde Irregular satellite of Neptune. Portuguese ( or língua portuguesa) is a Romance language that originated in what is now Galicia (Spain and northern Portugal. A saint (from the Latin sanctus) is a human being to whom has been attributed (and who has generally demonstrated a high level of Holiness and Sanctity
• SAO biscuits, a product of Arnott's
• SAO is the IATA Code for all airports of São Paulo, Brazil, mainly São Paulo-Guarulhos International Airport and Congonhas-São Paulo International Airport
• Sao (trilobite) is a genus of ptychopariid trilobite

SAO biscuits are a savoury cracker biscuit that was launched in Australia in 1906 by William Arnott Limited. Arnott's Biscuits Holdings (commonly known as Arnott's) is a subsidiary of the Campbell Soup Company of America. São Paulo ( is the largest city in Brazil, with its metropolitan area ranking among the largest urban areas in the world São Paulo/Guarulhos – Governor André Franco Montoro International Airport, also known as Cumbica International Airport, is a major Brazilian airport the Ptychopariida is a large heterogeneous order of Trilobite containing some of the most primitive species known

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