- HD 1080
- Runtime: 96m.
- Status: Released
- 0
- Languages: en
- Country: United States of America
- Director: Marilyn Agrelo
- Stars: Jessica Alba, Bailee Madison, J.K. Simmons, Chris Messina, Sônia Braga
- keywords: mathematician, elementary school, math teacher, scientist, woman director
- Production_studio: Ideal Partners, J2 Pictures, Silverwood Films
- Slogan: Count on the unexpected.
- providers: AMC Plus Apple TV Channel, AMC+ Amazon Channel, AMC+, IFC Films Unlimited Apple TV Channel
- The An Invisible Sign is featured in the top rankings of 2010
- #50 in Top Family Movies of 2010
Mona Gray is a 20-year-old loner who, as a child, turned to math for salvation after her father became ill. As an adult, Mona now teaches the subject and must help her students through their own crises.