For Altar panel we have a term and definition in Art.

Large painting of a religious subject, situated above an altar in a church.
Alto-rilievo (High relief). Technique of sculpting in which the figures are considerably raised or detached from the background. In a bas-relief the figures are only slightly raised from the surface.
Amber. Derived from Arabic, amber is a fossilized resin, reddish-yellow in colour and more or less transparant. It has been used from ancient times to make trinkets and jewellery.
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