used in particle physics, one of the grand unified theories is based on the SO(10) Lie group Names Sō, a Japanese surname and given name Su (surname) (/), a Chinese surname and a Korean surname () derived from it So (Korean name) (蘇 or 邵) Other uses So (סוֹא), King of Egypt, usually identified with Osorkon IV So (dairy product), a type of dairy product made in ancient Japan Sales order, an order received by a business from a customer Sao civilisation or So, an African civilisation and population that flourished from ca. the 6th century to ca. 15th century Shell on, a form of presentation in shrimp marketing Significant other, a partner in a romantic relationship Strikeout, in baseball See also Esso, an Exxon trade name, phonetic version of SO So and so (disambiguation) Só (disambiguation) S0 (disambiguation)