Pimp My Cross: What Does the Celtic Cross Mean?

The Celtic cross appears most frequently in Ireland, Scotland, and Wales, as well as in areas with strong Irish or Scottish heritage, such as parts of the United States, Canada, and Australia. It is commonly found on gravestones, monuments, and churches, especially those associated with Celtic Christianity. What does it mean?

The official Orthoprax Christianity website: http://orthopraxchristianity.org/