different between lookback vs loopback

English

lookback (plural lookbacks)

Alternative form of look-back
(finance, often attributive) A kind of exotic option whose payoff depends on the optimal (maximum or minimum) underlying asset's price occurring over the life of the option.
- 2009, Don M. Chance, Robert Edwin Brooks, An Introduction to Derivatives and Risk Management:
  Another interesting path-dependent option is the lookback option. A lookback call allows you to buy the asset at the lowest price and a lookback put allows you to sell it at the highest price attained during the life of the option.
- 2011, Frans de Weert, Exotic Options Trading:
  The principle of a lookback option is to give the investor the maximum payoff based on perfect hindsight.

loop +? back

loopback (countable and uncountable, plural loopbacks)

The routing of a signal, data stream, etc. from its origin back to the origin, primarily as a means of testing the transmission or transportation infrastructure.

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