Kaaba
/ˈkɑːəbə
/(also Caaba)
A square stone building in the centre of the Great Mosque at Mecca, the site most holy to Muslims and towards which they must face when praying. It stands on the site of a pre-Islamic shrine said to have been built by Abraham, and a sacred Black Stone is set in its south-eastern corner.
Origin
From Arabic (al-)ka‘ba, literally '(the) cubic house'.