viivoin

Viivoin is a Finnish term that translates roughly to "by lines" or "with lines." In typography, layout, and data visualization contexts, the term is used to describe elements that are delineated or annotated by lines rather than solid fills. The etymology traces to viiva (line) and the suffix -in, which in some constructions marks a manner or instrument. While not a common standalone term in standard Finnish, viivoin appears in editorial descriptions and design literature to indicate line-based separation, annotation, or emphasis. For example, it can describe a chart where data series are outlined with lines, a table with rows separated by rules, or text blocks highlighted by underlining or border lines.

The usage is largely confined to niche domains such as graphic design, publishing, and technical drawing, and it is less common in everyday language. There is limited formal grammar around the word, and it often occurs within larger expressions, such as "viivoin merkitty" or "viivoin erottelu." In English-language discussion, the term is rarely used, and the concept is usually described with phrasing like "outlined with lines" or "line-delineated." See also viiva, viivain, typografia.