Erik Heels looks at what numbers are trademarked: Trademarking Numbers
The number 1 is a registered trademark of Dale Ernhardt
The number (3) (in parentheses) is a registered trademark of Level 3 Communications.
The number 4 is a registered trademark of Swingline (as in staplers).
The number 5 is a registered trademark of Chanel (as in Chanel No. 5 perfume).
