Differentiate units of a coin with a stylized lowercase โbโ. Transition from saying โsatsโ to โbitsโ, or donโt. Both terms can work and โsatsโ likely to phase out naturally as new generations enter the network.
Just โฟ for units and BTC for whole coins is cumbersome and confusing.
All the cool kids will know the origin story and share the meaning of โsatsโ ; )