Illustrated Architecture Dictionary

Corner block
Also called a trim block

A square, relatively flat block of wood, often decoratively carved, placed at the upper corners on each side of the wood framing around a door

Bull's eye design sometimes found in Federal and Greek Revival styles where lintels are plain, a simple central panel and corner blocks being the only embellishment.

Foliate corner blocks are often found in Victorian interiors. 

Examples from Buffalo architecture:

Other examples:

Photos and their arrangement 2002 Chuck LaChiusa
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