What does the asterisks mean in writing?

Answer 1

It implies either an exception to something or a disclaimer to something or in charts and graphs it could be a reference on the graphs source.

Example:

"This is the best headache medicine ever" - Dr. Whatever

*statement not evaluated by the FDA

Answer 2

Asterisks in writing are often used to denote a footnote or to draw attention to a specific point or word. They can also indicate an omitted letter in a swear word or to censor inappropriate language.