Ban Khor Sign Language (BKSL; Thai: ภาษามือบ้านค้อ) is a village sign language used by at least 400 people of a rice-farming community in the village of Ban Khor in a remote area of Isan (northeastern Thailand).
[2][3][4] Known locally as pasa kidd ('language of the mute'), it developed in the 1930s due to a high number of deaf people.
[4] Thai Sign Language is increasingly exerting an influence on BKSL.
Even middle-aged hearing people are using Thai SL vocabulary mixed with BKSL.
Attitudes favoring Thai SL over BKSL are beginning to be expressed.