Unary numeral system

The unary numeral system is like counting on your fingers but using just one finger instead of all ten. Imagine that you have a number that you want to represent, let's say the number 5. Instead of holding up five fingers to show the number, you would just keep one finger up and count to 5 by saying "one, one, one, one, one". That's how the unary numeral system works. You use only one symbol, usually a line or a dot, to represent any number you want. So for example, you can write the number 9 like this: "111111111". It might take longer to write out large numbers, but the unary system is a simple way of counting and adding.