Cover: Cover is the purchasing futures to offset a short position (same as Short Covering or Covering Short Position). In some situation Cover is referred to as having in hand the physical commodity when a short futures sale is made, or to acquire the commodity that might be deliverable on a short sale.
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.
Low: Low is the lowest price of the day for a particular futures or options on futures contract.
Ring: Ring is a circular area on the trading floor of an exchange where traders and brokers stand while executing futures trades. Some exchanges use pits rather than rings.
Transaction: Transaction is an entry or liquidation of a trade.
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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.