UML

Represents persistent storage of data that can be read or written during the activity.

Produces a value based on a specification, such as a constant or expression.

Holds a constant value used by an action, often for configuration or control.

Groups a set of actions into a structured block, like a sub-process or loop.

Sends a signal to another object or system, often used for asynchronous communication.

Defines output data from an action.

A generic action with unspecified internal behavior. It’s a placeholder for implementation details.

Represents an object that is used or produced during the activity.

Combines multiple incoming flows into a single outgoing flow, typically after a decision.