NFA is the abbreviation of Not Financial Advice, which means "non-financial advice".

In the cryptocurrency community, it is often used as a disclaimer in discussions, articles, or posts about investment strategies, market predictions, or other finance-related topics.

Those who use NFA are indicating that they are not certified financial advisors and their statements should not be considered professional investment advice. This is to limit their legal liability and to remind readers or listeners to do their own research (DYOR) before making any investment decisions.