Call: There are three meaning of the "Call" term. It could be:
1) An option contract giving the buyer the right but not the obligation to purchase a commodity or other asset or to enter into a long futures position;
2) a period at the opening and the close of some futures markets in which the price for each futures contract is established by auction;
3) the requirement that a financial instrument be returned to the issuer prior to maturity, with principal and accrued interest paid off upon return.
Called: Called is another term for exercised when an option is a call. In the case of an option on a physical, the writer of a call must deliver the indicated underlying commodity when the option is exercised or called. In the case of an option on a futures contract, a futures position will be created that will require margin, unless the writer of the call has an offsetting position.
Contract: Contract is a term of reference describing a unit of trading for a commodity future or option. At the same time contract is an agreement to buy or sell a specified commodity, detailing the amount and grade of the product and the date on which the contract will mature and become deliverable.
Currency Swap: Currency Swap is a swap that involves the exchange of one currency (e.g., U.S. dollars) for another (e.g., Japanese yen) on a specified schedule.
Derivative: A financial instrument, traded on or off an exchange, the price of which is directly dependent upon the value of one or more underlying securities, equity indices, debt instruments, commodities, other derivative instruments, or any agreed upon pricing index or arrangement. Derivatives involve the trading of rights or obligations based on the underlying product but do not directly transfer that product. Derivatives are generally used to hedge risk or to exchange a floating rate of return for fixed rate of return. Derivatives include futures, options, and swaps. For example, futures contracts are derivatives of the physical contract and options on futures are derivatives of futures contracts.
Instrument: Instrument is a tradable asset such as a commodity, security, or derivative, or an index or value that underlies a derivative or could underlie a derivative.
Interest Rate Swap: Interest Rate Swap is a swap in which the two counterparties agree to exchange interest rate flows. Typically, one party agrees to pay a fixed rate on a specified series of payment dates and the other party pays a floating rate that may be based on LIBOR (London Interbank Offered Rate) on those payment dates. The interest rates are paid on a specified principal amount called the notional principal.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.