Celtic cross — Fotopedia
A Celtic cross is a symbol that combines the cross with a ring surrounding the intersection.

It is the characteristic symbol of Celtic Christianity, though the symbol has older, pre-Christian origins. Such crosses formed a major part of Celtic art. This design is also referred to as the high cross, Irish Cross, or the Cross of Iona.

The archaic English word for cross as an instrument of torture is rood (literally "pole", cognate with rod). The word cross in English derives only indirectly from Latin crux via Old Irish and possibly Old Norse, introduced in the 10th century.

Irish Myth
In Ireland, it is a popular myth that the Celtic cross was introduced to the island by Saint Patrick or possibly Saint Declan during his time converting the pagan Irish. It is believed that he combined the symbol of Christianity, a cross, with the symbol of the sun, to give pagan followers an idea of the importance of the cross by linking it with the idea of the life-giving properties of the sun. [W]
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A cross is a geometrical figure consisting of two lines or bars perpendicular to each other, dividing one or two of the lines in half. The lines usually run vertically and horizontally; if they run obliquely, the design is technically termed a saltire, although the arms of a saltire need not meet at right angles.

The cross is one of the most ancient human symbols, and has been used by many religions, most notably Christianity. It may be seen as a division of the world into four elements (Chevalier, 1997) or cardinal points, or alternately as the union of the concepts of divinity, the vertical line, and the world, the horizontal line (Koch, 1955).

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