Final answer:
In BPMN, the Exclusive Gateway symbol, resembling a diamond with an 'X', represents decision points where a project lead approves stages or requests changes.
Step-by-step explanation:
In Business Process Modeling Notation (BPMN), the symbol that one would use to identify the points at which the project lead approves a stage or asks for further changes is called a Gateway. Specifically, the Exclusive Gateway (often represented by a diamond shape with an 'X' inside) is used to control the flow of the process, deciding which path to take based on certain conditions, such as a decision or approval by the project lead. This ensures that the process flows in the intended direction after the project lead's decision has been made, either moving forward after approval or looping back for further changes.
The Business Process Modeling Notation (BPMN) symbol used to identify the points in which the project lead approves a stage or asks for further changes is the Gateway symbol. Specifically, the Exclusive Gateway (diamond shape) is commonly used for decision points where only one path can be taken based on certain conditions or criteria.