Sullorlo

Sullorlo is a term used in several fields to denote a boundary, seam, or transitional interface between two states, surfaces, or ideas. There is no single, universally accepted definition; its precise meaning depends on context and user. The term appears to be a neologism with Italian-leaning phonology, and there is no standardized etymology.

In linguistics and semiotics, sullorlo is sometimes described as a transitional zone at the boundary between phonological segments, syntactic units, or conceptual pairings, where features from both sides may blend or resist assimilation. In architecture and design, it can refer to a visual or structural seam where two materials or planes meet, such as the edge of a panel, tile, or molding line. In art and philosophy, sullorlo is used metaphorically to describe liminality, thresholds, or encounters between opposed forces.

Because usage varies, the term often requires definition within the document where it appears. See also: threshold, boundary, seam, interface, liminality.

No widely recognized standard references exist, and authors may attach different nuances to the term depending on disciplinary or creative aims.