An Ampersand Gets More Results Than All Other Punctuation, Combined
This is one of those few demonstrably true things. Even though it might actually be more accurately described as a symbol, in our character-challenged world of SEO Title tags we are more likely to view it in the same manner we view the disappearing punctuation mark.
But Google knows it is a logogram, and treats it as such, differently from the mere punctuation it eschews.
Try each one of these searches yourself and tell me which one is the outlier: [!], [@], [(], [)], [-], [;], [:], [“], [‘], [,], [.], [?], [/]—and—[&]!
& is also so well respected as to have its own eponymous magazine. Now what punctuation can also claim that?