The prefix used for `10^(9)` is nano.

Answer

To solve the question, we need to understand the prefixes used in the metric system for powers of ten. The question states that the prefix for \(10^9\) is nano, and we need to determine if this statement is true or false.

### Step-by-Step Solution:

1. **Identify the power of ten in the question**: The question refers to \(10^9\).

2. **Recall the meaning of the prefix "nano"**: The prefix "nano" corresponds to \(10^{-9}\). This means that "nano" is used to denote one billionth of a unit.

3. **Identify the correct prefix for \(10^9\)**: The prefix that corresponds to \(10^9\) is "giga". This means that "giga" is used to denote one billion of a unit.

4. **Compare the prefixes**: Since "nano" corresponds to \(10^{-9}\) and "giga" corresponds to \(10^9\), we can conclude that the statement in the question is incorrect.

5. **Final conclusion**: Therefore, the statement that the prefix used for \(10^9\) is nano is false. The correct prefix for \(10^9\) is "giga".

### Answer:
The correct answer is **FALSE**. The prefix used for \(10^9\) is "giga", not "nano".