Yläreunat

Yläreunat is a Finnish noun referring to the upper edges or the top boundary lines of an object or figure when it is oriented with a defined top. The term is the plural form of yläreuna, formed from the root reuna meaning edge and a prefix indicating upper position.

The word is used across several fields. In geometry and design, yläreunat describe the upper boundary lines of shapes, panels or components, especially in technical drawings, blueprints, and product descriptions. In architecture and carpentry, the term helps specify which edges lie at the top in a given assembly or section. In packaging and manufacturing, yläreunat can refer to the top edges of materials such as sheets, boards or containers as they are joined or finished.

In publishing and page layout, yläreunat commonly denote the upper margins of a page or layout area, describing the space above the main body text where headers or page numbers may appear. The concept emphasizes orientation and clearance relative to the top reference point.

Etymology and form: the word is built from ylä-, meaning upper, and reuna, edge, with the plural ending -t. The singular form is yläreuna.

See also: alareuna, the lower edge, and yläraja, the upper bound in mathematical or data contexts.