swingometer
From Longman Dictionary of Contemporary EnglishRelated topics: Television & radioswingometerswing‧om‧e‧ter /swɪŋˈɒmɪtə $ -ˈɑːmɪtər/ noun [countable] British English informalAMTPPG a piece of equipment used in television programmes to show how many votes each political party is getting during an electionExamples from the Corpusswingometer• But in such a setting Peter Snow's neon swingometer was, frankly, a disappointment.• A Radio Times election supplement shows the new swingometer.