Custom and Specialty Dice: Symbols, Shapes, and Rules

Custom and specialty dice are dice whose shape, face count, markings, or rules role differs from the familiar d4, d6, d8, d10, d12, and d20 set. The category is broad, so a useful catalogue record must describe what is physically present instead of relying on a marketing label such as “unique dice” or “gaming dice.”

What makes a die custom?

A die may be custom because it has nonstandard numbering, symbols instead of numbers, a commissioned shape, a special colorway, or a face layout designed for one game. Custom does not automatically mean rare, handmade, expensive, or more accurate. It is a description of the object’s relationship to a particular rules or product convention.

For example, a six-sided die with icons can be physically similar to a d6 but function differently because the game interprets the icons. A die with repeated values may have six faces while offering fewer distinct outcomes. A record should therefore store face count and face meanings as separate fields.

Common specialty categories

Symbol dice

Symbol dice replace numerals with icons, letters, colors, or combinations of marks. They are often tied to a specific game, expansion, or random table. The source rule should explain how each symbol is interpreted. If a symbol has several meanings in different modes, record those contexts separately.

Fate-style dice

Fate-style dice are six-sided dice marked with plus, minus, and blank faces. The Fate Core System Reference Document describes rolling four Fate dice and adding the symbols as a game-specific mechanic. DICEWIKI uses this as an example of a rules-defined specialty die, not as a universal standard for every plus/minus die sold.

Unusual face counts

Some objects have three, five, six, ten, twenty, or more faces. A rule may also simulate a face count that is difficult to manufacture. The D&D rules, for example, describe simulating 1d3 by rolling 1d6 and dividing by two, rounding up. This is a procedure, not evidence that a particular physical d3 exists in the product being catalogued.

Custom-numbered and range dice

A die can use repeated numbers, a limited range, tens markings, or values that are not consecutive. A percentile die is a familiar example: the markings and the two-die pairing create a 1–100 result. For a custom-numbered product, document the full marking scheme or a reliable source that lists it.

How to catalogue a specialty die

Record these dimensions independently:

1. Physical form: face count, shape, edges, vertices, dimensions, and stated material.
2. Markings: numerals, pips, symbols, colors, repeated outcomes, and orientation instructions.
3. Rules context: the game, table, or tool that explains how a roll is interpreted.
4. Product identity: brand, set, edition, release information, and product name.
5. Evidence: rulebook, publisher documentation, manufacturer catalogue, or a clearly documented inspection.

This separation prevents a common error: treating a die’s appearance as proof of what the game does with it. The physical record answers “what is it?” The rules record answers “how is it used?”

Fairness and unusual shapes

Unusual shape or markings do not by themselves prove that a die is biased, fair, or intentionally loaded. The theoretical probability depends on the stated sample space and assumptions. Any physical-balance claim needs an identifiable method, sample size, rolling conditions, and limitations. A product description may be recorded as a manufacturer claim, but it should not be rewritten as an independent test result.

Related DICEWIKI pages

Start with standard dice types and dice notation. For material records, see common dice materials. If a specialty die comes from a published game, link the record to the relevant dice game and name the rules source.

Sources and editorial notes

1. D&D Beyond Basic Rules: Playing the Game, for d notation and the rules example that simulates 1d3 with 1d6.
2. Fate Core System Reference Document: Fate Dice, for the plus, minus, and blank-face example.
3. DICEWIKI editorial taxonomy, for separating physical properties, markings, rules context, product identity, and evidence.