Sacral

When the sacral vertebrae are fused into a single structure, it is called the sacrum.

“Many of Cambaytherium’s features, like the teeth, the number of sacral vertebrae, and the bones of the hands and feet, are intermediate between Perissodactyla and more primitive animals,” Rose says.

An old site with sacral connotations.

Compromise is awkward when religion is involved, and the several South Asian writing systems are considered sacral.