Number Tropes

Tropes about numbers, general or specific.

General numbers:

 * 20% More Awesome
 * Alternative Number System
 * Arc Number
 * Cast Calculus
 * Disturbing Statistic
 * Eleventy-Zillion
 * Letters 2 Numbers
 * Memetic Number
 * The Notable Numeral
 * Numbered Homeworld
 * Numerical Theme Naming
 * Numerological Motif
 * Title By Number
 * Theme Table
 * Too Many Halves
 * Unusual Chapter Numbers
 * You Are Number Six

Specific numbers:

 * My Hero Zero
 * Two Out of Three Ain't Bad
 * Action Duo
 * Duo Tropes
 * Rule of Three
 * The Three Certainties in Life
 * Three Wishes
 * Power Trio
 * Three Plus Two
 * Third Time's the Charm
 * On Three
 * Four Is Death
 * Four-Man Band
 * 555
 * Five-Man Band
 * Six Is Nine
 * Six-Student Clique
 * Rule of Seven
 * Lucky Seven
 * The Magnificent Seven Samurai
 * Seven Is Nana
 * Rainbow Motif (Seven colors of the rainbow)
 * Thirteen Is Unlucky
 * 23
 * 42
 * The 47 Society
 * And 99 Cents
 * Law of One Hundred
 * 108
 * Number of the Beast (666)
 * Infinite