'Martingale' can refer to:
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Martingale (probability theory), a stochastic process in which the conditional expectation of the next value, given the current and preceding values, is the current value
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Martingale (tack) for horses
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Martingale (collar) for dogs and other animals
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Martingale (betting system)
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Martingale (rigging)
★ In the sport of
fencing, a martingale is a strap attached to the sword handle to prevent a sword from being dropped if disarmed.