Wang tile
A mark produced by gouging.
(in some German universities) A lecturer who may teach without supervision by a professor
(mathematics) A square tile with a colour on each side. Possible sets of such tiles are studied to determine whether they can tile the plane (arranged with like colours touching, and without rotations or reflections) and whether this can be done in a periodic pattern.
To take out the entrails of (herrings). / (Yorkshire) to retch
各辺に色がある正方形タイルは一見単純に見えますが、複数を組み合わせて平面を敷き詰めると驚くべき振る舞いが生じます。
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DiQt（ディクト）
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