Arcú

Arcú is a term used in several contexts, often as a proper noun in Celtic-inspired fiction and in discussions of speculative linguistics. There is no single, widely accepted definition of arcú across real-world references, and its meaning varies by source.

Etymology and usage: In many Celtic-tinged contexts, arcú is presented as a root or coinage derived from arc-/arcus ideas of curvature or enclosing form, echoing Latin arcus and related words, though its exact origin is not standardized. In non-fiction sources, arcú tends to be described as a fictional or constructed term rather than a canonical linguistic item.

In fiction and media: The term is frequently used as a name for places, factions, or phenomena that feature circular or enclosing properties. For example, arcú may denote a ring-shaped city, a defensive energy field surrounding a planet, or a boundary between worlds. Authors and game designers employ arcú to evoke ideas of protection, enclosure, or continuity, often aligning its symbolism with circles, cycles, and arcs. Its flexible usage has contributed to its popularity in worldbuilding circles.

See also: arc, arch, arcus, circle.