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A one-time reflector is a constellation or other pattern that can be hit by a glider to produce another glider travelling in a different direction. This contrasts with permanent reflectors, which will survive and can be reused to reflect further gliders; and with one-time converter, which produces an output different from the input.
If a constellation upon being hit by a glider instead produces a glider travelling in the same direction, it is known as a rephaser.