How to know chart period and pair from within indicator

 
I would like to specify certain time periods for certain pairs on which my indicator is to be used.   For example, if it is placed on the EURUSD, I need to look at the previous hi's, low's open's closes from 3 HOURS ago, 2 HOURS ago and 1 HOUR ago. If the indicator is placed on the GBPUSD then it needs to look at 3 DAYS ago, 2 DAYS ago, 1 DAY ago.     Could anyone help?
 

"How to know chart period and pair from within indicator"

Symbol() is the pair, Period() is the period