Pentadic numerals

Pentadic numerals are a notation for presenting numbers, usually by inscribing in wood or stone. The notation has been used in Scandinavia, usually in conjunction to runes.

The notation is similar to the older Roman numerals for numbers up to 9 (I–IIIIV). Unlike the Roman notation, the ticks are placed vertically on a stem or stav of the rune. The number 4 is represented by four horizontal lines on the stem, 5 is represented by what looks like an inverted letter U. 10 is represented by two U's opposing each other. Numbers up to 19, or even 20, can be represented by a combination of I's and U's.

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