A Latin cross or Crux immissa is a type of Christian cross in which the vertical beam sticks above the crossbeam.[1] This is the main representation of the cross by which Jesus Christ was crucified. The Latin cross began as a Roman Catholic emblem but later became a universal symbol of Christianity.[2] If displayed upside down it is called St. Peter's Cross because he was reputedly executed on this type of cross.[3] When displayed sideways it is called St. Philip's cross for the same reason.[3]
A Latin cross plan is a floor plan found in many cathedrals and churches.[4] When looked at from above or in plan view it takes the shape of a Latin cross (crux immissa).[5] The Latin cross plans have a nave with aisles or chapels, or both and a transept that forms the arms of the cross.[5] It also has at least one apse that traditionally faces east. Many also have a narthex at the entry.[5]