Which of the following is not a symbol of a circuit element ?

Options

A.
B.
C.
D.

Explanation

To solve the question "Which of the following is not a symbol of a circuit element?", we will analyze each of the given options to identify which one does not represent a circuit element.

### Step-by-Step Solution:

1. **Identify the Options**:
We need to look at the symbols provided in the options. The options typically include symbols for common circuit elements like batteries, switches, bulbs, and possibly other shapes.

2. **Analyze Option 1**:
The first option is a battery symbol. A battery is a common circuit element that provides electrical energy. Therefore, this is a valid circuit symbol.

3. **Analyze Option 2**:
The second option is a switch symbol. A switch is also a fundamental component in electrical circuits that controls the flow of electricity. This is also a valid circuit symbol.

4. **Analyze Option 3**:
The third option is a triangle symbol. A triangle is not typically used to represent any circuit element in electrical diagrams. Therefore, this symbol does not represent a circuit element.

5. **Analyze Option 4**:
The fourth option is a bulb symbol. A bulb is a common circuit element that converts electrical energy into light. This is a valid circuit symbol.

6. **Conclusion**:
After analyzing all options, we find that the triangle symbol (Option 3) is not a symbol of a circuit element. Thus, the correct answer is Option 3.

### Final Answer:
The symbol that is not a circuit element is **Option 3: Triangle Symbol**.