telltale (suomeksi)

juorukello (s: one who divulges private information / tattletale; squealer)
ilmiantaja (s: one who divulges private information)
kantelupukki (s: tattletale; squealer)
paljastaja (s: something that serves to reveal)
virtauslanka (s: nautical: yarn that indicates relative direction of airflow)
juorulanka (s: nautical: yarn that indicates relative direction of airflow)
peräsinkulman osoitin (s: nautical: mechanical attachment to the steering wheel)
näyttölaite (s: engineering: contrivance for indicating or recording something)
paljastava (a: engineering: contrivance for indicating or recording something)