MARKET on OPEN:  
  Abbreviation: MOO
  Additional Specifications: Buy/Sell-Quantity-Commodity-Month-Year
  Explanation of Order Buy/Sell order, regardless of price
  When to Use Expectations of a big immediate move or a quick profit taking
  How its Placed Buy /Sell placed prior to market open
  Broker/Online Placement Example Buy 7 March 2003 Silver on open