In the Olympics, each participating country is designated by a 3-digit code. The letters SUI represent Switzerland.
Nino Schurter Switzerland (SUI)
SUI is not an official abbreviation for any country
'Sui' is the accepted three word abbreviation for the country of Switzerland.
DE is the abbreviation of Germany. SUI is FIFA Country Code for Switzerland.
Olympics are called "les jeux olympiques" in French, often abbreviated as "les J.O."
Nicola Spirig Switzerland (SUI)
Roger Federer Switzerland (SUI)
Romania
Switzerland
Sui Lu China (CHN)
any country can do the Olympics