- holy of holies - (figurative) something regarded as sacred or inviolable; "every politician fears to touch that holy of holies, the Social Security System"
--1 is a kind of sacredness
- holy of holies, sanctum sanctorum - (Judaism) sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept
--2 is a kind of sanctuary
--2 is a part of Tabernacle - holy of holies, sanctum sanctorum - (Judaism) sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept