דְּבִיר
devir
inner sanctuary, the innermost room of the Temple · noun, masculine
The room behind the room. Everyone has heard of the Holy of Holies; almost nobody knows what to call it in Hebrew.
וּדְבִיר בְּתוֹךְ־הַבַּיִת מִפְּנִימָה הֵכִין לְתִתֵּן שָׁם אֶת־אֲרוֹן בְּרִית־יְהוָה׃
“"And the devir he prepared inside the house, in the innermost part, to place there the ark of the covenant of the LORD." (1 Kings 6:19)”
What is the devir in your own home — the room or corner you keep most private?