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A cross is a geometrical figure consisting of two intersecting lines or bars, usually perpendicular to each other. A cross of oblique lines, in the shape of the Latin letter X, is also termed a saltire in heraldic terminology.
From the first century BC it is used to indicate an instrument used in executions.
The Greek word is used in Early Christian descriptions of the execution cross, which indicate that its normal shape was similar to the Greek letter tau (Τ).
Due to the simplicity of the design (two intersecting lines), cross-shaped incisions make their appearance from deep prehistory; as petroglyphs in European cult caves, dating back to the beginning of the Upper Paleolithic, and throughout prehistory to the Iron Age.
Also of prehistoric age are numerous variants of the simple cross mark, including the crux gammata with curving or angular lines, and the Egyptian crux ansata with a loop.
Speculation has associated the cross symbol – even in the prehistoric period – with astronomical or cosmological symbology involving "four elements" (Chevalier, 1997) or the cardinal points, or the unity of a vertical axis mundi or celestial pole with the horizontal world (Koch, 1955).