Ray or RAY may refer to:

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  • Ray (geometry), half of a line proceeding from an initial point
  • Ray (graph theory), an infinite sequence of vertices such that each vertex appears at most once in the sequence and each two consecutive vertices in the sequence are the two endpoints of an edge in the graph
  • Ray (optics), an idealized narrow beam of light
  • Ray (quantum theory), an equivalence class of state-vectors representing the same state

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