yes, in the same way gymnastics rules are- if you know where to look and what to look for
for international senior- including the olympics, armstand is required for men but not for women. I believe ncaa rules are different though as i think females do the same as males.
There are 6 classes of dive - if the dive number starts with
1 - forward
2 - back
3 - inward
4 - reverse
5 - twist
6 - armstand
the letter indicates shape A- straight, B- pike, C tuck, D- free.
The other numbers are number of half twists and number of somersaults. I won’t go into that unless someone really wants to know
now men compete 6 dives, women compete 5.
so on platform, the armstand is required for men as they must do 6 dives, each a different group.
Women only do 5, so they can choose 5 out of the 6, so they can leave out armstand.
On springboard there is no armstand, so men do 5 dives, one from each group, and then choose one to repeat. Women to one from each.