Evaluate the Absolute Value Expression: |3| = ?

To solve this problem, we will determine the absolute value of the number 3:

• Step 1: Recognize that the number given is 3, which is a positive number.
• Step 2: According to the rules of absolute values, the absolute value of a positive number is the number itself.
• Step 3: Therefore, $|3| = 3$.

In conclusion, the absolute value of 3 is $\mathbf{3}$.