Chuvash numerals is an ancient numeral system

Numeral system

A numeral system is a writing system for expressing numbers, that is a mathematical notation for representing numbers of a given set, using graphemes or symbols in a consistent manner....

 the Chuvash people

Chuvash people

The Chuvash people are a Turkic ethnic group, native to an area stretching from the Volga Region to Siberia. Most of them live in Republic of Chuvashia and surrounding areas, although Chuvash communities may be found throughout all Russia.- Etymology :...

 used. (Modern Chuvash use Hindu-Arabic numerals.)

Those numerals originate from finger numeration. They look like Roman numerals

Roman numerals

The numeral system of ancient Rome, or Roman numerals, uses combinations of letters from the Latin alphabet to signify values. The numbers 1 to 10 can be expressed in Roman numerals as:...

, but larger numerals stay at the right side. It was possible to carve those numerals on wood. In some cases numerals were preserved until the beginning of 20th century.

Numeral	Chuvash numeral
1	I
5	/
10	X
50	(upside down)
100
500
1000

Examples

Hindu-Arabic	Chuvash
2	II
4	IIII
6	I/
19	IIII/X
32	IIXXX
47	II/XXXX