Close: Close is the exchange-designated period at the end of the trading session during which all transactions are considered made "at the close."
Commission: Commission is a fee charged by a broker or brokerage house (company) to a customer (trader) for executing a transaction. In the future market commission is
1) The charge made by a futures commission merchant for buying and selling futures contracts;
2) the fee charged by a futures broker for the execution of an order. Note: when capitalized, the word Commission usually refers to the CFTC.
Futures: Futures (also called Futures Contract) is a legally binding agreement to buy or sell a commodity or financial instrument at a later date. Futures contracts are normally standardized according to the quality, quantity, delivery time and location for each commodity, with price as the only variable.
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.
Pit: Pit (also referred to as a ring) is the area on the trading floor where trading in futures or options contracts is conducted by open outcry. It is a specially constructed area on the trading floor of some exchanges where trading in a futures contract or option is conducted. On other exchanges, the term ring designates the trading area for commodity contract.
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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.