Schematic symbol preferences are very personal, but it is important to make them understandable. How do your drawings compare to this engineer's guidelines?

Scope Symbols are included to depict mathematical functions, graphs, process equipment, instruments, and electrical equipment. The symbols are suitable for use in dynamic displays, as on cathode-ray ...

The popular but older standards: PMC 22.1-1981, Functional Diagramming of Instrument and Control Systems; ISA 5.2-1976, Binary Logic Diagram for Process Operation; and ISO 3511, Graphical Symbols for ...