Zipper:

zipper American English /Zip British English :
1 [countable] two lines of small metal or plastic pieces that slide together to fasten a piece of clothing
The zip on my skirt had broken.
do up/undo a zip
Your zip's undone at the back.
2 [uncountable] informal speed, energy, or excitement:
This car goes with a bit more zip than my last one.
A spoonful of mustard will give the dish some zip.
3 [singular] American English informal nothing at all or zero:
We beat them 10 to zip.
'How much money do you have left?' 'Zip!'