ST0

ST0 is a designation used in several technical domains to denote a starting point or baseline. The meaning is highly context-dependent, and there is no universal definition for ST0.

In computing and automata, ST0 is commonly used to label the initial state in a finite-state machine, process model, or protocol specification. From this state, primary transitions begin, and subsequent actions or events are defined with respect to ST0. The label helps readers identify where system behavior begins in diagrams, tables, or formal descriptions.

In timing, synchronization, and data signaling, ST0 can refer to a zero-time or zero-offset reference point. It may mark the moment from which timestamps, phase references, or data samples are measured, aiding alignment and comparison across components or systems.

Product naming and documentation sometimes use ST0 as a model or version code within a family of devices or software releases. In such cases, the accompanying documentation defines the configuration, features, or intended use associated with ST0.

In software development, some codebases adopt ST0 as an identifier for an initial or default state, especially in state machines, initialization routines, or configuration pipelines. This usage is not standardized and varies by project, sometimes appearing as a constant, label, or tag within source code and documentation.

Because ST0 spans multiple domains, readers should consult the relevant glossary or technical specification to interpret its meaning in a given document. See also: state machine, time reference, model code.