# Zero

Updated: 09/12/2023 by Computer Hope

Zero may refer to any of the following:

1. Zero is a numerical value represented as "0" that equals nothing and is not negative or positive. On a computer keyboard with a numeric keypad, there are two 0's. One zero in the top number row of numbers, and the other 0 on the keypad.

Tip

The Maya's are believed to introduce zero when they developed the base-20 system of mathematics in 260 B.C.

## What symbol is on the 0 key?

On U.S. keyboards, the 0 key is on the same key as the close parenthesis.

## Other computer terms with "zero" in them

The following list contains other computer-related terms with "zero" in them.

Tip

For computer terms that start with the number 0, see our computer number terms.

2. In binary, 0 is Off.

Tip

In ASCII (American Standard Code for Information Interchange), the numerical value of "0" is "048" in decimal (00110000 in binary).

Tip

Doing the Alt code Alt+48 creates a "0" character.

3. The number 0 is also with the Alt+0, Command+0, Ctrl+0, and Shift+0 keyboard shortcuts.

4. With a regular expression, \0 represents a null character.

5. The letter "O" is sometimes confused with the number zero (0). To help differentiate between an "o" and zero, a zero may have a dot or a forward slash. Showing the zero this way helps the reader quickly identify numbers from letters. For example, looking at the picture, you can quickly identify the zero in the "COMPUTER H0PE" text. However, in the font used here on the website, the "0" is not as easy to notice.

6. When "0" and "x" is used as a prefix (e.g., 0xCD), represents a hexadecimal number.

7. With some Toshiba computers, pressing 0 is used to access the hidden partition.

8. Zero is a chatbot developed by Computer Hope from 2003 to 2009. The chatbot was later used to help create Hopebot.