Ask: The price that you need to pay for a symbol. This price could represent a ratio. For example if the Ask price for EURUSD is 1.4137 the buy price of EUR is 1.4137 times the price of USD.
Bid: The price that you can sell a symbol. This price could represent a ratio. For example if the Bid price for EURUSD is 1.4133 the sell price of EUR is 1.4133 times the price of USD.
CFD: Contract For Difference. Click here for more information.
ISO: The International Organization for Standardization
PDA: Personal Digital Assistance refers to a hand-held device that acts like a computer. It enables you to reach the Internet, answer your emails, and much more. BlackBerry® is well-known PDA in North America.
Symbol: In MetaTrader symbol refers to the name of the items that you can sell or buy. It usually refers to the name of a currency pair. For example EURUSD could be a symbol that refers to Euro versus US Dollar.