anchor point

noun3

1. •
   A place to which things are anchored.
2. •
   A point on the body, such as the chin or the corner of the mouth, that an archer touches with the string hand when the bow is fully drawn, in order to maintain a consistent draw.

   • Tournament archers generally use a lower anchor point, with the string hand under the chin. — 1997
3. •
   (figurative) Something that provides stability or a connection.

   • David Brill was one of my anchor points in our community. Knowing that he was out on the line searching in the best tradition of investigative reporting lent a sense of security. — 1979