In computing what is the smallest movement of a mouse called?

Question
What would you do with a Romeo’s Rouser?
Answer
Drink it – its a real ale

Question
What are Acheron, Cocytus and Phlegethon?
Answer
Rivers of Hell

Question
What is the name of Porky Pigs father?
Answer
Phineas Pig

Question
What is Lolita’s surname in Vladimere Nabokovs novel
Answer
Haze