Post-it font here refers to the font used in the logo of Post-it, which is a brand of repositionable notes invented and manufactured by 3M.
The Post-it logotype is probably set in Helvetica Black originally designed by Max Miedinger. The font is a commercial one and you can view more details about it here.
Download Helvetica Font
The Helvetica font identified above is not available for free, please follow the link above and purchase a font license to download and use the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.