st

St is a two-letter combination with several distinct meanings in English and other contexts. Its interpretation depends on capitalization and usage, spanning religious, geographic, measurement, and coding systems.

Saint: In religious and place-name contexts, St. (or St without a period in some variants) stands for Saint. It derives from the Latin sanctus and is used before the names of holy people or places, such as St Patrick or St Louis. In signage and addresses, the abbreviation is common in American English, while other varieties may omit the period.

Street: St is widely used as an abbreviation for Street in English-language street names and addresses, appearing on signs, maps, and postal listings (for example, Main St or Oak Street). Regional punctuation conventions vary, with some styles using a trailing period and others not.

Stone: In British Imperial units, st stands for stone, a unit of weight equal to 14 pounds (about 6.35 kilograms). It remains in common use in the UK and Ireland for body weight and some traditional measures, though metric units are increasingly prevalent.

Language and country codes: In language tagging, st is the ISO 639-1 code for Sesotho (Southern Sotho), one of the official languages of Lesotho and South Africa. The two-letter code ST is also used as the ISO 3166-1 alpha-2 country code for Sao Tome and Principe, and its internet domain is .st.

Other uses: Depending on context, ST and st can appear in various acronyms and identifiers across computing, transportation, and administration, but the above meanings are among the most common.