Ask or Offer

The lowest price at which someone is willing to sell the security. When combined with the bid price information, it forms the basis of a stock quote.

Contrarian

Similar to value investor. Looks for stocks with prices beaten down out of proportion to fundamentals. 

Ask Size

The aggregate size in board lots of the most recent ask to sell a particular security.

Convertible Security

A security of an issuer (for example – bonds, debentures, or preferred shares) that may be converted into other securities of that issuer, in accordance with the terms of the conversion feature. The conversion usually occurs at the option of the holder of the securities, but it may occur at the option of the issuer.