karttalevyinen
Karttalevyinen is a Finnish term that translates to "map-disc" or "chart-disc" in English. It refers to a type of plate or disc that is used in various applications, often related to navigation, mapping, or mechanical systems where precise angular positioning is required. These discs typically have markings or divisions that correspond to specific angles or directions, similar to those found on a compass rose or a protractor.
Historically, karttalevyinen might have been used in nautical instruments for determining bearings or in early surveying