New learning.
I just noticed this in the advertising section of the forum.
The Bitcoin software, network, and concept is called "Bitcoin" with a capitalized "B". Bitcoin currency units are called "bitcoins" with a lowercase "b" -- this is often abbreviated BTC.
Image:
http://prntscr.com/mblnlfMeaning when I am paying someone in
Bitcoin then I am sending him
bitcoins 
We are
Bitcoiners and
bitcoins are our currency.
Thank you.
This is new for me and i just know from your thread, indeed a new information for me.
So, we can say when we want to talk about the currency unit, we call it 'bitcoins' (BTC). And other than that, we call it 'Bitcoin'.
I hope my understanding gone right and won't creating misunderstanding.