What is the STD full form?
Subscriber Trunk Dialling is the STD meaning. It uses for call on those states which is different where's calling from. For ex. A person calling from Madhya Pradesh to Uttar Pradesh or any other state will be the Subscriber Trunk Dialling where charges for call will be different as compare to current local charges.
About FFM - This is a small blog with small information or detail on short words. Here, I will let you know the all possible abbreviation for short words.
