Default: Default is the failure to perform on a futures contract as required by exchange rules, such as a failure to meet a margin call or to make or take delivery.
Fill: Fill is the execution of an order.
Intermediary: Intermediary is a person who acts on behalf of another person in connection with futures trading, such as a futures commission merchant, introducing broker, commodity pool operator, commodity trading advisor, or associated person.
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.
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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.