Helvetica

Helvetica is a typeface created by Swiss typographer Max Miedinger. Created in 1957 it quickly became the most commonly used typeface in the world and was credited by many well renowned graphic designers as the perfect typeface that could be used in almost every scenario. 

Today, it is still the most commonly used typeface in all forms of graphic design and can be seen on almost every sign, brand or advertisement you see. It is also the default font for use on Mac computers, the industry standard for graphic design.

While some famous graphic designers, such as Erik Spiekermann protest strongly against it, believing it to be the immediate sign of 'bad design', it is still universally loved for it vast versatility and is still viewed as the iconic typeface for modernism due to it's simple, clean and efficient design.