30576 Hanoi Sign Language 10000-99999 "Since there has never been a census of deaf people in Viet Nam, the real number of signers is unknown. However, some estimate of the number of signers can be made.... Using United Nations estimates of 1 person out of every 1,000 person born profoundly deaf or becoming profoundly deaf at an early age, there would be an estimate of 38,878 deaf people living in the area where HNSL is used. The estimated number of users of HNSL is up to 39,000 users." Ha Noi Sign Language On 39000 10000-99999