Oddly in Firefox the tab name showing the title only gets as far as 𝑼𝒏𝒊𝒄𝒐 before giving up with what looks like a box with D835 in it.

The tab name is shortened in the middle of the sequence.

I still don't know what the sequence is though, any Unicode expert to explain? Apparently is d835 "invalid"?

http://www.charbase.com/d835-unicode-invalid-character

Edit: I see now emillon explains:

"U+1D48F whose UTF-16 BE encoding is d8 35 dc 8f."

That's:

http://codepoints.net/U+1D48F

"MATHEMATICAL BOLD ITALIC SMALL N"

I get 𝑼𝒏𝒊𝒄𝒐...