Sign language
Fingerspelling is not universal. It is different in different sign languages. Two sign languages may have a similar fingerspelling system. Or, their fingerspelling systems may be very different. Some fingerspelling systems use only one hand. ASL uses a one-handed system. Other sign languages use both hands for fingerspelling. The BANZSL languages use a two-handed system. There are different fingerspelling systems for different writing systems. Japanese is written with different letters than English. This means fingerspelling in Japanese Sign Language is different from fingerspelling in ASL or BANZSL. ASL uses a lot of fingerspelling. Most sign languages use less fingerspelling than ASL. Some sign languages don't use fingerspelling at all.