nyan thos - Shravaka

"The first of the two practitioners in the Hinayana tradition that reaches Nirvana is called in Tibetan nyan thos, or Shravaka in Sanskrit.[...] nyan is to listen, and thos is to hear, such as listening while hearing teachings."

http://jigtenmig.blogspot.com/2007/09/nyan-thos-shravaka.html