Offline
I some thread recently UT made reference to a "hanky code" for silent communication about sexual preferences.
Come to find out there are many of them, each seemingly trying to simplify the last
I see a huge fly in the ointment in that you can only buy a limited number of colors.
If you get clever and dye your own you'll play hell trying to get three people to agree what the color is.
There are many many more..