OffOn

Offon is a term used informally to describe a binary control state that alternates between inactive/off and active/on. It is formed from the words "off" and "on" and is commonly encountered in both hardware and software contexts.

In hardware, the concept is embodied by two-position switches, pushbuttons, or slide levers that switch a circuit between a disconnected (off) and connected (on) condition. Depending on design, the "off" position may break the circuit or simply route signals to a safe state. Some devices implement an "off" detent that prevents accidental reversion to "on" without deliberate action. Latching toggles maintain a state until changed.

In software and devices with user interfaces, an offon toggle is a control that indicates a binary state; it can be represented as a switch or checkbox-like element. Good practice includes explicit labeling, aria-checked semantics for assistive technologies, and a default state that matches typical user expectations.

Origin and usage: The term is colloquial; more formal terminology uses "off-on switch" or "toggle switch" to describe the mechanism. In documentation, "off/on" may appear in product specifications to denote power states or feature enablement.

See also: toggle switch, binary state, power switch.