I don't know if this is the right place to do so, but it says on the website to first propose ideas for BIPS to the mailing list. 

I would like to propose @bitficus idea for a satoshi symbol (monetary).

The idea has been floated around to switch to satoshi as a base unit.

The lightning network uses satoshis as a base unit. 

Here is the proposal : https://twitter.com/bitficus/status/1097979724515557377 

Pleas let me know if it would be appropriate to write a BIP for it. 

Thank you for your consideration.