There are two main dialects of TSL centered around two of the three major sign language schools in Taiwan: one in Taipei, the other in Tainan City (the Taichung school used a sign language essentially the same as the Tainan school).
TSL, like other sign languages, incorporates non-manual markers with lexical, syntactic, discourse, and affective functions. These include brow raising and furrowing, frowning, head shaking and nodding, and leaning and shifting the torso.
Sasaki, Daisuke. (2007). "Comparing the lexicons of Japanese Sign Language and Taiwan Sign Language: a preliminary study focusing on the difference in the handshape parameter," Sign Language in Contact: Sociolinguistics in Deaf Communities (David Quinto-Pozos, editor). Washington, D.C.: Gallaudet University Press. ISBN 9781563683565; OCLC 154789790
Smith, Wayne H. Taiwan Sign Language research: an historical overview. Language and Linguistics (Taipei) 6.2 (2005): 187-215. Online free access
^a Sign-language names reflect the region of origin. Natural sign languages are not related to the spoken language used in the same region. For example, French Sign Language originated in France, but is not related to French.