Satoshis are the smallest unit of a bitcoin. 100,000,000 Satoshi is equal to 1 bitcoin, 1 Satoshi = 0.00000001 bitcoin. In the future (where bitcoin is way more valuable), it would be much easier to use Satoshis as a unit of price, but unlike the BTC logo where it is the bold B with the two slashes, there doesn't seem to be a logo like this for the Satoshis unit. Can we as a community create and settle on a logo for Satoshis and start maybe test using it? It will take a while for it to catch on but it is for the better.
TLDR : Create a logo for Satoshis, the smallest unit of bitcoin, like the BTC logo and start using it.
You have a good point on that.
As bitcoin becomes mainstream and it is proportionated into smallet amounts the need for a logo will rise.
However, I think that it is a little bit early and this logo is going to be developed when the time will come. The community act a lot of fact when actions like this one will make us communicate easier.