Alright, so now we have "w", which is pronounced "woo"!
Thumb and index finger up; all other digits (or fingers) down.
And that actually gives me an idea!
If you wouldn't mind, might I suggest we do a little "woo"'ing and "ah"ing? First: "Woo...!":
Thumb and index finger up; all other digits (or fingers) down...
(Thumb and little finger up, middle finger resting over-top of thumb muscle (so that it is NOT sticking up, in order to avoid inadvertently giving someone "the finger"!) and the ring and index fingers tucked underneath the thumb muscle)
(the above gesture, as I originally presented it, represents decimal "10" or "ten"; but in duotrigesimal, it would be "a" or "ah"!)