ticker

Short definition from Wiktionary

Noun

1. 1
   One who makes a tick mark.
2. 2
   A measuring or reporting device, particularly one which makes a ticking sound as the measured events occur.
3. 3
   A ticker tape, either the traditional paper kind or a scrolling message on a screen.
4. 4
   A heart, especially a human one.
5. 5
   A watch (timepiece).
6. 6
   A birdwatcher who aims to see (and tick off on a list) as many bird species as possible.
7. 7
   A beer drinker who aims to try as many different beers as possible and keeps a record of all the beers they have drunk.