Helfametl Number System
Double Base 3/9
Numbers are grouped by both 3's and 9's, in both speech and symbols. This has its roots in the people's observation of the planet's two moons, one of which rises and sets 9 times in a day, and the other other of which rises and sets 3 times in one day (for reference, one day of Cigglai time is equal to a little over 19 Earth days).
Unary means that their numeral symbols work like tally marks. Positional means that the symbols are arranged in columns that denote powers, such as 90, 91, 92, 93, 94, &c. For example, in base-10, you have the ones place (100), the tens place (101), the hundreds place (102), &c. In Helfametl, numerals are positional, that is, arranged by powers, but unary is used to denote numbers below 9 in each position, e.g., two groups of 81 would be marked by two "tallies", or dots over the bottom dash, in the 92 position.
The number given on the left is how the notation would read i