To indicate that a letter or a string of letters represented numbers, a letter Y was placed either side of them.
A popular notion is that the three sides and the strings of the balalaika represent the Holy Trinity.
A string written in boldface represents a group of symmetries of Euclidean 3-space.
The strings that don't make it to the next level represent characteristics left out of our abstractions, as do the holes without strings at all.
A string of n qutrits represents 3 different states simultaneously.
While Null indicates the absence of any value, the empty string and numerical zero both represent actual values.
This string represents the "monochord" with which the sources equate the invention.
But consumer advocates worry that the money, and the strings that come attached, represent a new type of creeping commercialism.
For example, the string represents a strip of four squares with a toad on the first one, and a frog on the last one.
There are several mechanisms by which strings of digits can represent numbers.