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D'ni numeration is a fictional number system used in the Myst and Riven series of video games which has the mathematical particularity of counting in base 25.

How to convert a number into D'ni?

The D'ni numeral system uses the base 25 to count and therefore has 25 symbols.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

Note that there is a 26th symbol which is equal to 25 , just like is also 25.

To convert a number (integer, in decimal writing), start by writing it in base 25 (see writing in base N), then substitute each value (between 0 and 24) by the corresponding D'ni symbol.

The conversion begins by replacing each symbol of the base 25 D'ni by its value (between 0 and 24) then processing the number obtained as written in base 25 in order to convert it to base 10 (decimal).

Example: matches the digits $ 4 $ and $ 23 $, i.e. $ [4,23]_{(25)} $ hence the conversion calculation $ 4 \times 25 + 23 = 123 $ in base 10.

How to recognize D'ni digits? (Identification)

The D'ni numeric symbols are square and have inside either lines (horizontal, vertical or diagonal) or arcs of circles connecting 2 adjacent corners.

Any references to Myst and Riven video games are clues.

Source code

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Cite as source (bibliography): D'ni Numerals on dCode.fr [online website], retrieved on 2023-10-01, https://www.dcode.fr/dni-numerals