The 0.6db refers to the noise figure on the LNB Howard, whether it be enhanced, Universa, Tri-band or otherl, with this figure lower is better but as discussed on previous threads, you can pay a lot of money for an LNB with a "supposedly" very low noise figure, but gain very little improvement.
The term Universal applies to the frequency coverage, the old Enhanced LNB had a Local Oscillator of 9.75 Ghz, so would down convert by that amount, the Universal has two Local Oscillators (down convertors), one at 9.75 Ghz and one at 10.6 Ghz and by the use of tone switching can therefor cover a wider frequency band.