The Roman numeral X; a crossing or intersection in the form of an X.
From Latin decussis, the Roman numeral for ten (X). The word refers both to the numeral itself and to anything arranged in that X-shape.
The Roman numeral X came from the way Romans counted—they'd mark groups of ten by crossing two lines (V + V), creating a symbol that looks like an X!
Complete word intelligence in one call. Free tier — 50 lookups/day.