To me this obviously looks like sticky notes you can add in books or on files to categorize content, a.k.a. quite literally tags.
They're supposed to be the old-school paper tags with a hole in the narrow end [0].
These tags, like floppy's and manila folders, will live on in our iconography even as someone born this decade is unlikely ever encounter the real thing. I was recently amused to explain to my kid what the dialer icon on the iPhone is: "well, a long, long time ago (it's getting close to 20 years now since the Nokia 3310 sold over a 100 million units and we got rid of our landline) we used to have stationary phones in our homes and you would talk into a wired handset that looked like this icon".
[0] https://www.amazon.com/Martha-Stewart-Crafts-Kraft-Tags/dp/B...