.st is the Internet country code top-level domain (ccTLD) for São Tomé and Príncipe. The code is marketed worldwide as an abbreviation for various entities.

Second-level domains

Registrations are taken directly at the second level, but some names have been reserved for use in specialized third-level registrations (though not all of these are actually in use at present):

Other uses

The .st domain is being marketed as a general-use domain, with a number of meanings suggested, including the abbreviation of "street", "state", short for "Star Trek" and more. The .st domain is also commonly used to create domain names that spell words ending in st, such as bur.st or ho.st. It is used for URL shortening domains like The Washington Post's wapo.st, and PlayStation's play.st.

Smalltalk

The Smalltalk programming language uses the .st extension, and several websites about it use the .st domain.

Styria

The state of Styria, in Austria, has ST as its official abbreviation on Austrian vehicle registration plates. Therefore, the .st extension is used by some small businesses located in Styria.

South Tyrol

Also some registrations in South Tyrol, an autonomous, chiefly German-speaking Italian province, use the .st extension to abbreviate Südtirol, its German name.

Telstra

Australia's Telstra, uses tel.st as a shortcut to its main website. The shortcut is occasionally used for marketing purposes.

Australia Post

Australia Post uses mypo.st as a shortcut to its site when sending SMS alerts.

Washington Post

The U.S. newspaper The Washington Post uses wapo.st (along with wapo.com) as a shortcut redirect to their main URL washingtonpost.com

Meta Quest

Meta leverages the domain metaque.st as a shortcut to their online store, which features their "Quest" line of virtual reality products.