The whistle comes from The Hunger Games films, adapted from Suzanne Collins novels, where Rue teaches Katniss a four note Mockingjay signal workers used in District 11 orchards. Mockingjays repeat human sounds in the story, so the tune became a symbol of alliance and later rebellion. After the first film in 2012 fans shared the Spanish named silbido sinsajo as a ringtone and meme cue, whistling it in videos, at events and as a recognisable call between friends online.