VO

Vo is a two-letter sequence that appears in several unrelated domains and does not have a single, universal meaning. In media production and broadcasting, VO (voice-over) refers to a narration track recorded separately from the on-screen action, used to provide dialogue, narration, or translation. VO work is typically performed by a voice actor and may accompany film, television, documentaries, or advertisements.

In language coding, vo is the ISO 639-1 two-letter code for Volapük, an early constructed international auxiliary language created in the 1870s by Johann Martin Schleyer. Volapük gained initial popularity but was later superseded by Esperanto and remains of interest mostly to linguists and language enthusiasts.

In software design and engineering, VO stands for Value Object. A value object represents a descriptive aspect of a domain concept, identified by its attributes rather than a unique database key. Value objects are often immutable and compared by value, enabling safe replacement and easier reasoning about state.

In distributed computing and grid projects, VO commonly stands for Virtual Organization. A virtual organization is a dynamic coalition of individuals and institutions that pool resources and permissions to achieve shared research or computing goals, often across institutional and geographic boundaries.

Vo can also appear as a proper noun in personal names, notably as a surname in Vietnamese contexts, where diacritics such as Võ may be transliterated as Vo in international usage. This reflects the broad, cross-domain use of the term across technology, language, media, and culture.