Safe
A position in a Game is safe for a player 
if the person who plays next (player 
) will lose.
- Zeuthen's Rule
- Zeuthen's Theorem
- Zig Number
- Zigzag Permutation
- Zig-Zag Triangle
- Zillion
- Zipf's Law
- Z-Number
- Zollner's Illusion
- Zonal Harmonic
- Zone
- Zonohedron
- Zonotype
- Zorn's Lemma
- z-Score
- Zsigmondy Theorem
- Z-Transform
- z-Transform
- z-Transform (Population)
- Embeddable Knot
- Embedding
- Empty Set
- e-Multiperfect Number
- Enantiomer
- Enantiomorph