In a UML (Unified Modeling Language) Activity Diagram, the symbol used to represent a task (or action/activity) is a round-cornered rectangular box. This shape denotes an individual piece of work or step carried out within the process.
The other symbols represent:
A filled in circle (B): The Initial Node (start of the process).
A diamond shaped box (C): A Decision or Merge Node (a point where a choice is made or paths recombine).
A bullseye (D) (a filled circle inside an outer circle): The Activity Final Node (end of the process flow).
(Reference: BCS Modelling Business Processes / BCS Business Analysis Practice – UML Activity Diagrams)
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