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.
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.
Long: Long Futures trader is a trader who has bought futures contracts or options on futures contracts or owns a cash commodity. Long position (long trading) is opposite to Short position (Short trading).
Low: Low is the lowest price of the day for a particular futures or options on futures contract.
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."
Open Outcry: Open Outcry is a method of public auction for making bids and offers in the trading pits of futures exchanges. Open Outcry is common to most U.S. commodity exchanges, where trading occurs on a trading floor and traders may bid and offer simultaneously either for their own accounts or for the accounts of customers. Transactions may take place simultaneously at different places in the trading pit or ring. At most exchanges outside the U.S., open outcry has been replaced by electronic trading platforms.
Par: Par refers to the standard delivery point(s) and/or quality of a commodity that is deliverable on a futures contract at contract price. Serves as a benchmark upon which to base discounts or premiums for varying quality and delivery locations. Par in bond markets refers to an index (usually 100) representing the face value of a bond.
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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.