I don't think that's nearly as close to Carbon5's logo as the SiFive logo is to Carbon5's, but fair point, there's always overlap in these... when I posted that

I don't think that's nearly as close to Carbon5's logo as the SiFive logo is to Carbon5's, but fair point, there's always overlap in these... when I posted that I actually couldn't see the difference between their logos and was genuinely a bit confused if they were connected, but I see a small difference at the bottom of the Pentagon now... so it seems unlikely there's an intentional connection, but was genuinely confused at first!