Yeah, we call them "sats".
You can call them bitpennies if you like.
But don't call them 'a' Bitcoin. It's Bitcoin, like cents are Dollars, but a cent is not 'a' Dollar ffs
Not sure where in the thread you saw anyone saying "a Bitcoin" ¯\_(ツ)_/¯
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Then you don't need BIP 177, because sats are bitcoin.
We already use them, when we pay somebody 'in Bitcoin'.
But we normally don't pay them in 'Bitcoins'