Final answer:
The angle formed by the pubic bones below the symphysis pubis is known as the subpubic angle, which varies in size between males and females.
Step-by-step explanation:
The angle formed by the pubic bones below the symphysis pubis is called the subpubic angle. This anatomical feature is made up of the bodies and inferior pubic rami of the adjacent pubic bones, which extend downward and laterally to join with the ischial ramus, forming the ischiopubic ramus. The subpubic angle is noteworthy for its differences in size between males and females, being broader in females, which is an adaptation for childbirth.