British sign language is the sign language used by the deaf in Great Britain. Although the United States and Britain share a spoken language, British Sign Language is separate and distinct from American Sign Language. One example of their differences is that ASL uses a single-handed alphabet while BSL uses two hands for their fingerspelling system.
... a way to make money. They sell books and videos, often with ridiculous ideas about nutrition.
A more disturbing, and a practice more often acknowledged to be quackery, ...