1. Any notation that uses 12 different characters

Type of: mathematical notation

• idiomatic expression
• idiomatical
• idiomatically
• idiopathic
• idiopathic disease
• idiopathic disorder
• idiopathic hemochromatosis
• idiopathic thrombocytopenic purpura
• idiopathy
• idiosyncrasy
• idiosyncratic
• idiot
• idiot board
• idiot box
• idiot light
• idiot savant
• idiotic
• idiotically
• idiotism
• Iditarod
• Iditarod Trail
• Iditarod Trail Dog Sled Race
• idle
• idle pulley
• idle talk