Local: Local is a member of an exchange who trades for his own account. Traditionally Local trades on an exchange floor, and Local's activities provide market liquidity.
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.
Electronic Trading Facility: Electronic Trading Facility is a trading facility that operates by an electronic or telecommunications network instead of a trading floor and maintains an automated audit trail of transactions.
Exchange: A central marketplace with established rules and regulations where buyers and sellers meet to trade futures and options contracts or securities. Exchanges include designated contract markets and derivatives transaction execution facilities.
Pit: Pit (also referred to as a ring) is the area on the trading floor where trading in futures or options contracts is conducted by open outcry. It is a specially constructed area on the trading floor of some exchanges where trading in a futures contract or option is conducted. On other exchanges, the term ring designates the trading area for commodity 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.
Trading Arcade: A facility, often operated by a clearing member that clears trades for locals, where e-locals who trade for their own account can gather to trade on an electronic trading facility (especially if the exchange is all-electronic and there is no pit or ring).
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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.