The β symbol has the meaning Greek Small Letter Beta. It belongs to the category Greek Symbols. Here is the second letter of the Greek alphabet. By the way, you pronounce the β sign the way you write it. The beta sign is currently used in geometry to denote an angle. But it is also used in physics as a sign of beta radiation. You can copy the beta symbol by pressing the copy button below. An example of an application for the sign of Beta would be: “The angle β is 90 ° and therefore a right angle.”