It is a time code clapper. That is the easiest name for it, but there are more technical terms. Here is an example: http://www.coffeysound.com/product.php?productid=369&cat=117&page=1
a action verb starting with the letter Y could be yell.
yield Yell Yawn Yodel Yank Yearn
D
In the army the sergeant yells "Attention". In the courtroom they shout "All Rise." Filming a movie they shout "Action." The railroad conductor yells "All Aboard."
yard, year or yell year year, yule, yaks, yell
For starting a scene they might yell: "Cameras Ready! Set! Action!" To stop a scene they might yell: "Cut!" At the end of take they might yell: "That's a wrap!"
Megaphone.
Yes, "yell" is considered an onomatopoeic word because it imitates the sound of a loud, sharp cry or shout.
yell
Yell
a action verb starting with the letter Y could be yell.
Yell, yodel, yank
Scream and yell for help.
One is to lock yourself in your own locker, bang and yell to be let out, then blame an upperclassman for it.
Walk,Run,Jump,Talk,Yell,Complain,Hop
yield Yell Yawn Yodel Yank Yearn
you will need a pan a big spoon and some microwave bacon . first microwave the bacon put it on a plate and lay it on your parents night stand. then if they dont wake up from the smell of the bacon get he pan and the big spoon and bang it together and yell WAKE UP!