Z

Z is the twenty-sixth letter in the English language. It holds an important place in leet because in all variants it is used for substitution as well as substituted for.

Hard Leet
Z can be replaced by: 5 2

Z can replace: S

Soft Leet/Middle Leet
Z is treated identically to how it is in Hard Leet.

Et Cetera
Z is vital for the suffix -zorz.