Fascinating Friday: What does YKK mean on your zipper?

For this #FascinatingFriday, we're asking you to XYZ -- examine your zipper.

These are all the zippers available in this size. It will not be restocked.

YKK 9 regular zippers

YKK Vislon Zippers by the Dozen Choose From 23 Colors Molded Plastic Teeth Zippers 3VST Closed Bottom 4 to 10

Ever wondered what the 'YKK' on zippers stood for? It's so simple!

I found a zipper not made by YKK : r/mildlyinteresting

Made in USA- BEST ZIPPER QUALITY MADE . Can be used for home, sewing, and craft projects

9 & 10Assorted YKK Nylon Zippers- 25 of The Hottest Colors of The Season-Great for Sewing & Craft Projects-Made in USA

10 amazing zipper facts you didn't know you wanted to know - Marketplace

WOVEN-IN TOUGH ZIPPER (Item Code: EYL) - YKK Americas

Drysuit Zipper - BDM / YKK PROSEAL® AQUASEAL® Airtight Zip - Waterproof Zip

Ykk Metal Teeth Open Ended Zips Zippers Choice of Zip Length & Colour

Water-resistant vs. Waterproof Zipper: What's the Difference? - YKK Americas