Specifically,
Tigrinya belongs to the
Ethio-Semitic language family. It is spoken in the
Tigray province of
Ethiopia,
Eritrea (where it is one of two primary languages, with
Arabic),
Sudan, and
Israel.
Tigrinya has a unique 200-character script, which comes from the ancient language of Gee'ez. Each phoneme has its own character, as opposed to each vowel or consonant in English. Enough people speak Tigrinya that it's an interface option in Google.
Sources:
http://www.ling.upenn.edu/~gene/languages/tigrinya.html
http://home.planet.nl/~hans.mebrat/eritrea-languages.htm