1. Korean Sign Language (KSL): This is the most common sign language in South Korea and is used by the deaf community. It has its own unique grammar and vocabulary and is distinct from other sign languages around the world.
2. Korean Oral Sign Language (KOSL): This is a sign language used by people who are hard of hearing or have a hearing impairment. It is a less formal sign language and is often used in conjunction with spoken Korean.
It's important to note that both KSL and KOSL are distinct languages and should be treated with respect. If you're interested in learning more about them, there are resources available online and in South Korea.