Vietnamese sign languages
The three deaf-community sign languages indigenous to Vietnam are found in Ho Chi Minh City, Hanoi, and Haiphong.The HCMC and Hanoi languages especially have been influenced by the French Sign Language (LSF) once taught in schools, and have absorbed a large amount of LSF vocabulary.The influence of LSF may have obscured the links: the highest cognacy is with Haiphong Sign, which has been the least influenced by LSF.There are attempts to develop a national standard language, Vietnamese Sign Language (Vietnamese: Ngôn ngữ ký hiệu Việt Nam).^b Denotes the number (if known) of languages within the family.