Why does the Indicator Symbol / Icon in the navigator window has an "f"

[Shubham Shubham]

http://www.metaquotes.net/c/16/2009/7/MetaTrader4_custom_indicator_scripts_icon.jpg

 

Why does the  Indicator Symbol / Icon in the navigator window has an "f"   ?   It should have been in "i" or something else.  You can check the image in the above link. 

[[Deleted]]

Very Good question. i did not think this in my 3 years of trading.

probably f -means function ?