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.
Instrument: Instrument is a tradable asset such as a commodity, security, or derivative, or an index or value that underlies a derivative or could underlie a derivative.
Low: Low is the lowest price of the day for a particular futures or options on futures contract.
Yield: Yield is a measure of the annual return on an investment.
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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.