Trilithon
（重定向自Trilith）
A trilithon (or trilith) is a structure consisting of two large vertical stones (posts) supporting a third stone set horizontally across the top (lintel). It is commonly used in the context of megalithic monuments. The most famous trilithons are those of Stonehenge in England, those found in the Megalithic temples of Malta, both of which are UNESCO World Heritage Sites, and the Osirion in Egypt.