Anvelope

Anvelope is a term that has appeared in limited, informal usage and does not have a single, widely accepted definition. In general, it is described as a boundary or enclosing layer around a collection of elements, but exact meaning varies by context and author.

In geometry and data analysis, some writers treat anvelope as a minimal enclosing boundary that may be concave, in contrast to the convex hull. In this sense, anvelope is the tight outer shell that contains all points, allowing indentation along the boundary. In engineering and materials science, the term is occasionally used metaphorically to denote a protective outer layer surrounding a component or assembly, similar to an envelope around a package.

Etiology and usage notes: The term appears to be a modern coinage derived from the English word envelope; it is not listed in major dictionaries. Some uses appear as typographical variants or speculative jargon rather than established terminology. When encountered, authors typically define the intended meaning explicitly to avoid confusion.

Related concepts include envelope, convex hull, concave hull, convex envelope, and boundary. The term remains obscure outside niche discussions and is rarely used in formal literature.