Buzzer sounded during a match

• Stadium ear piercer
• Infernal South African buzzer
• Football match horn
• South African horn, seen at football matches
• Horn banned from the 2014 World Cup
• Horn made famous at the 2010 World Cup
• Loud horn much heard during the 2010 World Cup in South Africa
• Cape horn?

Wiktionary Word definitions in Wiktionary
n. A trumpet-shaped horn, now usually plastic, that produces a loud buzzing sound.