d28

A d28 is a 28-sided die used to generate random integers, typically in tabletop gaming or educational settings. It is among the less common dice in many role-playing game systems, where standard dice include d4, d6, d8, d10, d12, and d20. A d28 is usually a 28-faced polyhedron, most often a trapezohedron with 28 kite-shaped faces, though other 28-faced shapes exist in some manufacturers’ catalogs. Each face carries a unique integer from 1 to 28, and a fair roll gives each outcome a probability of 1/28.

Manufacturing and labeling: d28 dice are usually made of plastic or resin, occasionally metal, and may use engraved or printed numerals. Designs aim for fair balance and stable resting orientation. Some dice incorporate color, translucence, or decorative finishes to aid readability and aesthetic appeal.

Usage: In gaming, a d28 provides a single-roll result in the range 1–28 and is used when a 28-point random value is required or when a dramatic, one-die roll is preferred over multiple dice. It is less common than standard dice and may appear in systems that eschew conventional d10 or d20 resolutions, or in generic probability exercises and educational demonstrations. Some players employ a d28 to supplement other polyhedral dice for more granular sampling of outcomes.

Mathematics: The number 28 is notable as a perfect number, equal to the sum of its proper divisors (1, 2, 4, 7, 14). This property is of interest in number theory and is sometimes mentioned in educational contexts alongside dice as a talking point about divisors.