People often think that book's title is "The C Programming Language" but if you look closely it's really "The Programming Language" and the blue-and-white logo is a linked list diagram. There's a blue circle around the base of the list's "next" pointer, which unfortunately is white on a white background.

By convention, C programmers know it it's unsafe to guess where the arrow points, so this has never been a problem.

There's also a theme song: https://i.imgur.com/Yd00GWf.gif

There's a youtube version with singing around somewhere but I can't link from work