Wikipedia contributors, ".si," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=.si&oldid=211333968
.si is the Internet country code top-level domain (ccTLD) for Slovenia. It is administered by the ARNES, the Academic and Research Network of Slovenia. In 2010, the registry has hosted 80,000 domain names. In 2012, that number increased to 100,000 .si domain names when the domain zj.si was registered by Jasico d.o.o.
Domain hacks for the .si TLD are quite popular, since si is second person singular of the to be verb in the Slovene language. As such, many domains have been created that are using such domain hacks, one of the most popular being zadovoljna.si ("You are pleased", female form).
Sí also translates from Spanish as yes, so the TLD has been used by some Spanish-language websites. A notable example of this is the Mexican political party MORENA, whose website is found at morena.si.
Pepsi also has a pep.si TLD to shorten links.