Avenir was designed by Adrian Frutiger in 1988. It is a Geometric Sans Serif type and was released by Linotype GmbH. Avenir is french for future, this type was created as a type for the future. It has influences from other types such as Futura and Erbar. Originally Avenir was released in three weights, eventually over time it developed more wights and fonts. In 2004 Frutiger reworked the typeface to adjust to on-screen display issues. It was called Avenir Next. Avenir does not have italics, it only has obliques. These were mathematically constructed just about perfectly. I read some where it said they have dimensions of godly craft.
Avenir has been used from logos, to Amsterdam, to airports and Apple even used it for maps at one point. Some interesting things about Avenir are that the "O" is not a perfectly round, only obliques, and the vertical strokes are thicker than the horizontal strokes.
“From all these experiences the most important thing I have learned is that legibility and beauty stand close together and that type design, in its restraint, should be only felt but not perceived by the reader.”
~ Adrian Frutiger
I't still not sure why the backgrounds are a shade of grey.