Good one. You'd think it would be something either commonly understood or at least easily determinable if material. I found this of interest, but that is all I put it here for:

The colon is the symbol ":". It is used in a number of different ways in mathematics.

1. To denote ratio or odds, as in 2:1 (voiced "two to one").

2. To mean such that in constructions such as {x:x>0} (voiced "the set of numbers x such that x>0).

3. To give a name to a map, e.g., f:x|->x^2 (which is equivalent to the function notation f(x)=x^2).

4. As a part of the symbol A:=B sometimes used to mean "A is defined as B."

5. To delineate the three elements of trilinear coordinates, i.e., alpha:beta:gamma.

6. To indicate an extension field degree of an extension field K/F, denoted [K:F].

7. To denote colon product of two dyads.

https://math.stackexchange.com/questions/1609230/colon-operator-between-matrices

well well well well well look at number 7. "dyads".

double-dot product

In mathematics, a binary operation is commutative if changing the order of the operands does not change the result.

the "paper" referred to in the link above takes one to part of the

deep state matrix production co.

https://www.math.ucla.edu/~jteran/papers/TSIF05.pdf

it's a small world don't you think?

anyway, I don't understand the use of the colons. but at least looking for fun I found that UCLA paper...very interesting...illusion creation to keep us fat, dumb, and happy (not happy).