Apsis
Either of two points on the orbit of a planet or satellite that are nearest to or furthest from body around which it moves.
The Apsis Mount from AXL Advanced allows the direct and low profile mounting of any pouch that uses the industry-standard Safariland 2-Hole pattern, or the ELS hardware.
I always thought those two orbital points were the apogee and perigee. So I looked up “apsis” in Wikipedia. I promise I won’t do that again.