Optima is used to spell out CERN’s name in the logo.
This typeface is innovative as it was the first sans-serif typeface to include curves. Its combination of curves and straight elements give it clear readability and lend it elegance when used in large font sizes.
Helvetica Neue is a complement to Optima as it has clear straight lines, is easily readable and timeless.
CERN’s partial location on Swiss soil is also reflected in this typeface.
Arial is an alternative choice in case you don’t have access to those two fonts family on your computer.
For all the presentations PPT Arial is the primary recommendation.
For more informations please look here:
If you wish to give a particular look and feel to certain documents, another font may be used.