[kortex]

We really goofed as a society on that one. "But humans have ten fingers!" Well, we actually have 8 3-segment fingers and 2 thumbs, meaning you can count a dozen on one hand, and a gross on two, using thumbs as a cursor.

You can also form a set of 12 symbols that is visible from farther away by doing shapes similar to ASL:

1-4: fingers held up

5-8: touching tip of finger with thumb

9-12: touching top of 2nd phalanx with thumb.

Holding down the pinky in isolation is tricky so this kinda favors starting with pinky out as 1, but you could make assorted variants of this system work.

Fractions would be so nice to work with in "dozenal metric".