The Ticker code for a share is a few Letters and numbers that are used to identify the company on the Stock market
A few examples would be
Easyjet = EZJ
British Telecom = BT
Dominoes Pizza = DOM
Hangar Eight = HGR8
You will use these to add shares to your monitor in Advfn and to buy and Sell shares with your broker they are a bit like an abbreviation.