This is a woggle used to hold a scout scarf closed. Its the Australian Scout Symbol made 3d and put on a ring. The default sizing is good for the smaller kids scarves and to make it for adults, upsize it by 20%.
I made a bunch of these and then did a scout program that was all about computers and did a quick show of how I made the woggles and then gave them all one at the end. Looks great made from glow in the dark filament!