The NEMA or industry standard symbol for a ___ is shown at III in Figure 320.11.

The standard symbol for a buzzer, as represented in NEMA standards, reflects a specific design that is universally recognized in electrical schematics and wiring diagrams. The symbol for a buzzer typically includes characteristics that distinguish it from other sound-emitting devices, such as bells and horns.

Buzzers are often used in alarm systems and notifications due to their ability to produce a distinct, penetrating sound that can alert individuals effectively in various environments. The NEMA symbol associated with buzzers simplifies identification in circuit diagrams, ensuring that electricians and engineers can clearly communicate the intended function of the device within a system.

In contrast, other sound-emitting devices like bells and horns have distinct applications and sound characteristics that necessitate different symbols to avoid confusion in installations and controls. This clarity in representation is crucial for proper assembly and maintenance of electrical systems, enhancing safety and efficiency in electrical work.