Security: Generally, Security is a transferable instrument representing an ownership interest in a corporation (equity security or stock) or the debt of a corporation, municipality, or sovereign. Other forms of debt such as mortgages can be converted into securities. Certain derivatives on securities (e.g., options on equity securities) are also considered securities for the purposes of the securities laws. Security futures products are considered to be both securities and futures products. Futures contracts on broad-based securities indexes are not considered securities.
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.
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.