I applaud your attempt but the logos are too plain (simply types "Sat") and too long (3 characters).
It is best if you work on a better design and try to come up with only 1 character logo instead of 3. That way it could be similar to any other currency symbols such as: $ € ¥ BTC.
I'm not an expert,but here are my two cents.
A logo and a currency symbol are two different things,because currency symbols are NOT logos.
They are just symbols.
A symbol can be a logo as well(Apple logo),but a logo can be a symbol and sometimes it can consist the name of the company,brand,product,etc.
I don't know what exactly is OP trying to create-a logo or a currency symbol.I don't think that this design can serve both as a logo and a currency symbol.A currency symbol must contain only one letter,not three.