The correct answer is option 'D', Triangle.


Flowcharts are graphical representations of a process or algorithm, commonly used in computer programming and other fields to depict a sequence of steps. Various symbols are used in flowcharts to represent different elements of the process. Here are some commonly used symbols:

1. Rectangle:
- The rectangle symbol represents a process or an action to be taken.
- It is used to depict any operation or task that needs to be performed.
- The process or action is written inside the rectangle.

2. Parallelogram:
- The parallelogram symbol represents an input or output operation.
- It is used to depict any input or output action, such as reading data from a user or displaying results.

3. Diamond:
- The diamond symbol represents a decision point.
- It is used to depict a condition or a question that has two or more possible answers.
- The flow of the chart can diverge based on the outcome of the decision.

4. Triangle:
- The triangle symbol is not a valid flowchart symbol.
- It does not represent any specific element or action in a flowchart.
- Therefore, option 'D' is the correct answer as it does not correspond to a valid flowchart symbol.

In flowcharts, these symbols are connected by arrows to show the flow and sequence of the process or algorithm. The arrows indicate the direction of the flow, guiding the reader through the different steps and decisions. By using these symbols and connecting them appropriately, complex processes can be visually represented and analyzed in a structured manner.