**Math:** the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically.

Also, mathematical procedures, operations, or properties.

## Dictionary : Letter Z

**Z-score**

How many standard deviations a value is from the mean.

**Zepto-**

A prefix meaning one-sextillionth (1/1,000,000,000,000,000,000,000 or 10^{-21})

The same as multiplying by 10^{-21} (which is 0.000 000 000 000 000 000 001)

Prefix is **z**

**Zero**

The whole number between −1 and 1, with the symbol 0

Shows that there is no amount.

**Zetta-**

A prefix meaning one sextillion (1,000,000,000,000,000,000,000 or 10^{21})

The same as multiplying by 10^{21}

Prefix is **Z**