Why not just use the bitcoin logo. Lightning is bitcoin. Still you're symbol is cool
What are everyone’s thoughts on https://satsymbol.com/? I like it well enough and I do think we need a clear, instantly recognizable symbol for sats (which are the standard) but sometimes I think it looks a bit too much like the eth symbol.
Discussion
Of course lightning is still bitcoin. Sats as a unit exist both on the base chain and on lightning. We need a separate symbol for sats because 10 BTC is not the same as 10 sats! :)