I am surprised a lot of people didn't know it.

Specially the old members like OP.
(it's not a criticism

)
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It is described in this site described in the bitcoin site
"Bitcoin - with capitalization, is used when describing the concept of Bitcoin, or the entire network itself. e.g. "I was learning about the Bitcoin protocol today."bitcoin - without capitalization, is used to describe bitcoins as a unit of account. e.g. "I sent ten bitcoins today."; it is also often abbreviated BTC or XBT."Source:
https://bitcoin.org/en/vocabulary#bitThe sentence used by @pamoldar is a great example of how to and when to use Bitcoin with a capital B and with a small letter b.
Wasn't the first post clear enough to understand? Why posting to say the same thing