Investopedia explains 'Long Leg'
For example, consider a bull call spread on a stock trading at $25. This spread would involve buying a call option at a strike price of say $26, and the simultaneous sale of a call option at a higher strike price, say $27. Both options would have the same expiration date. In this case, the $26 call constitutes the long leg of the spread, while the $27 call makes up the short leg.
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