Uncovered Options Trading System
Close: Close is the exchange-designated period at the end of the trading session during which all transactions are considered made "at the close."
Closing Price: Closing Price is the same as Settlement Price. Closing price is the last price paid for a future contracts on any trading day. The closing price (or closing price range) recorded during trading that takes place in the final period of a trading session's activity that is officially designated as the "close."
Range: Range is the difference between the high and low price of a commodity, futures, or option contract during a given period (trading session, week, month, year, etc).
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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.