It's used in the book as a salute to their leader.
Nazi salute, literally "hail victory".
Nazi troops were marching through town while townspeople shouted "Heil Hitler!".
Word, Page, and Passage
HeilSilence was requested by a man on a podium. His uniform was shiny brown. The iron was practically still on it. The silence began.
His first words: "Heil Hitler!"
There are no synonyms for this word.