A popular modernist typeface that's used just about everywhere, such as in corporate logos, signs, posters, operating systems, advertisments, and et cetera. Odds are you've seen it more than enough times in your life to memorize the distinct shape of each letter.
Graphic designers love and loathe Helvetica for its modernist appearance and practicality, and its adaption for any practical purpose.
I watched that Helvetica documentary last night, and I fell asleep at the 20 minute mark. Pretentious documentary is pretentious.