gravity pen

A trademarked brand of self balancing, gravity defying magnetic pens that look like magic. Usually written as "Gravitypen". Invented in 2001 by Terrence Saucier. Manufactured and sold by Gravitypen LLC.
Gravity pen is a spelling sometimes used by grifters, scammers, and competing companies trying to rip off the trademarked name.
However, "gravity pen" is also used along side "Gravitypen" by Gravitypen LLC to help with SEO and to make it easier to find online.

Calling your scam product gravity pen is a good way to get your pants sued off.