I need help to understand symbol and it's full name from market watch window.....trying to search document that gives detail about each symbol.
For starters, have a look at these search results here
The first one Opening and Placing Orders looks useful perhaps.
Suggest also that by using the search box - top right all site pages, you will narrow down your search.
Regards "..detail about each symbol." - maybe you mean more fundamental learning like available here.