Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEC

Push button plan mark

On installation plans a momentary push button is drawn as a small circle, often with a smaller concentric circle or dot inside, at the wall position. It is used for door bell pushes, assistance call pushes, door release buttons and timer pushes, with a tag clarifying which.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Push button. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A schematic push button shows contacts; the plan mark shows the position of the accessory only.

Full reference

HAN1B

IEC

Audible bell

A bell indication identifies an audible annunciation output in a control circuit.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer
Form evidence: Audible bell. Autodesk IEC-60617 Symbol Preview — Audible indication and protective component forms; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

A bell symbol does not establish sound level or alarm priority.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.