Tjugosidig

Tjugosidig is a term used in Scandinavian languages to denote something that has twenty sides, most commonly a twenty‑sided die (often abbreviated as d20) used in tabletop gaming. The twenty‑sided die is a geometric object that has become a standard component in many fantasy and role‑playing games.

Geometrically, a twenty‑sided die is a regular icosahedron, comprising 20 congruent triangular faces, 12 vertices, and 30 edges. The faces are arranged so that the die can balance on any face and yield a random result when rolled. In most dice sets, the faces are numbered from 1 to 20, and many models are designed so that opposite faces sum to 21, though numbering schemes can vary by manufacturer.

Materials and construction vary widely. Common choices include plastic (such as acrylic or resin), but d20s are also produced in metal, wood, or composite materials, and they may be transparent, translucent, or opaque with different color schemes and finishes. Typical sizes for a standard gaming die range roughly from about 20 to 25 millimeters across, depending on the design.

Uses and significance. The d20 is most closely associated with tabletop role‑playing games, where rolled results determine the success or failure of actions, combat outcomes, and skill checks. Beyond gaming, the d20 serves as a practical example of a uniform discrete random variable in probability education. Culturally, the twenty‑sided die has become an iconic symbol of fantasy gaming and is commonly collected in varied designs and aesthetics by enthusiasts.