## Abbreviation for Standard Deviation

**SD**

### How to Pronounce Standard Deviation

To say “standard deviation” out loud, you can break it into three parts: “stan-dard de-vi-a-tion.”

### What Does Standard Deviation Mean?

Standard deviation is a measure of how spread out numbers are in a set. It tells you how much the numbers in a data set differ from the average (mean) of the set.

#### Other Examples

- A low
**standard deviation**indicates that the values tend to be close to the mean of the set, while a high standard deviation indicates that the values are spread out over a wider range.ย — Wikipedia

### Synonyms for Standard Deviation

Other words or phrases that mean something similar to standard deviation include:

- Variability
- Spread
- Dispersion

### The History of the Word

The term “standard deviation” has been around for quite some time. It was first introduced by the mathematician Karl Pearson in the late 19th century.

### When to Use the Abbreviation

You can use the abbreviation SD whenever you’re writing about or discussing standard deviation in a more casual or informal setting.

In more formal contexts, it’s often better to use the full term.

### Example of the Word and Abbreviation in Context

Let’s say you have a class of students, and you want to know how much their test scores vary from the average score.

You could calculate the standard deviation (SD) to get a sense of the spread of scores.