1. Any notation that uses 12 different characters

Type of: mathematical notation

• flicker
• flickering
• flickertail
• flier
• flies
• flight
• flight attendant
• flight control
• flight deck
• flight engineer
• flight feather
• flight indicator
• flight line
• flight maneuver
• flight manoeuvre
• flight of stairs
• flight of steps
• flight path
• flight recorder
• flight simulator
• flight strip
• flight surgeon
• flighted
• flightily
• flightiness