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.
Bid: Bid is an expression of willingness to buy a commodity at a given price. This is an offer to buy a specific quantity of a commodity at a stated price. Bid is opposite to Ask. Bid price is the price level at which a trader is ready to buy an offered commodity.
Cash Commodity: Cash Commodity (also referred to as Actuals.) is the actual physical commodity as distinguished from the futures contract based on the physical commodity. Cash Commodity sometimes called spot commodity
Close: Close is the exchange-designated period at the end of the trading session during which all transactions are considered made "at the close."
Exchange: A central marketplace with established rules and regulations where buyers and sellers meet to trade futures and options contracts or securities. Exchanges include designated contract markets and derivatives transaction execution facilities.
Open: Open is the period at the beginning of the trading session officially designated by the exchange during which all transactions are considered made "at the open."
Opening: Opening is the period at the beginning of the trading session officially designated by the exchange during which all transactions are considered made "at the opening."
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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.