Related to Equities:

Buy: Purchase of an equity

Buy to Cover: The purchase of a long position to offset a short position.

Sell: Liquidations of an equity.

Sell Short: Borrowing a security from a broker and selling it, with the understanding that it must later be bought back (hopefully at a lower price) and returned to the broker. SEC rules allow investors to sell short only on an uptick or a zero-plus tick.

Related to Mutual Funds:

Buy: An order to purchase shares of a mutual Fund.

Exchange: An order to sell shares of one fund and purchase shares of another fund generally within the same fund family and class. See the prospectus of the fund for conditions and any costs related to an exchange.

Sell: An order to sell shares of a mutual fund.

Related to Options:

Buy to Open: Buying an option contract to establish a new position.

Buy to Close: Buying an option contract to close out a pre existing short position.

Sell to Close: Selling an option contract to close out a pre existing long position.

Sell Covered Call: Selling a call option contract to open when the account holds the underlying security.