
Students communicate in sign language at a special school for hearing-impaired children in Yaounde, Cameroon, Sept. 22, 2025. The International Day of Sign Languages is observed annually on Sept. 23. (Xinhua/Kepseu)

A teacher gives a lesson on sign language at a special school for hearing-impaired children in Yaounde, Cameroon, Sept. 22, 2025. The International Day of Sign Languages is observed annually on Sept. 23. (Xinhua/Kepseu)

A teacher gives a lesson on sign language at a special school for hearing-impaired children in Yaounde, Cameroon, Sept. 22, 2025. The International Day of Sign Languages is observed annually on Sept. 23. (Xinhua/Kepseu)

Students attend a sign language class at a special school for hearing-impaired children in Yaounde, Cameroon, Sept. 22, 2025. The International Day of Sign Languages is observed annually on Sept. 23. (Xinhua/Kepseu)