They are drinks that born in the 1880s with the idea of adding the Soda Water to drink Sour.
There are many possible variations of this drink:
Silver Fizz: with the addition of an egg white;
Golden Fizz: with the addition of egg yolk;
Royal Fizz: with the addition of a whole egg;
Diamon Fizz: Champagne instead of soda;
Green Fizz: with a dash of Creme de Menthe.