Which diagram symbol looks like a square and represents a processing step?

• A. Storage Location
• B. Processing Symbol
• C. Decision Symbol
• D. Input/Output Symbol

Answer: (B)

In flowcharts, the shapes map directly to the kind of action taken. A processing step is shown with a rectangle, which may appear square-like in some diagrams. That shape indicates an operation that changes data, such as calculations or data manipulation. So the symbol that represents a processing step is the Processing Symbol (the rectangle).

The other shapes correspond to different things: a decision is a diamond used to branch the flow, input/output is typically a parallelogram for receiving or displaying data, and storage locations are depicted differently (often as a data store symbol like a cylinder or a distinct storage shape).