In computers or audio amplifiers, what is the process in which part of the output returns to the input?

In art, the goddess Diana is usually shown holding which weapon? In basketball, what is it called when a player gets the ball after a missed shot bounces off the rim or backboard? In "Blood and Gold", which author fills in details about the life of 2,000-year-old vampire Marius? In commercials, kids reach past the "purple stuff" to get which orange-colored drink? In English, which Texas city's name means "the body of Christ"? In Game 2 of the 1956 World Series he was knocked out in the second inning; in Game 5, he was perfect. Who is he? In "Henry VI, Part 1" it's a setting; in "Romeo and Juliet" it's a suitor for Juliet's hand. What is it? In his 1841 essay "Self-Reliance", who wrote "Nothing is at last sacred but the integrity of your own mind"?