You can add symbols to your process flow diagram in which each symbol represents a person or group responsible for a task, decision, or output.

The standard is intended to provide sufficient information to enable anyone reading a flow diagram and having a reasonable amount of plant knowledge to understand the means of measurement and control ...

Symbols are used to create circuit diagrams. ... Voltage (V) is the 'push' which makes electricity flow around the circuit. In a thunder storm, lightning is formed by natural static electricity.