Level 2
A trading service consisting of real-time access to the quotations of individual market makers registered in every Nasdaq listed security, as well as market makers' quotes in OTC Bulletin Board securities.
Investopedia Commentary
This allows you to watch the trades being executed right in front of you. Also known as Level II.
Related Links
Electronic Trading Tutorial
See also: Level I, Level III, Market Maker, Nasdaq
Also spelled: Level2, Level II, Level Two