Okay, I’ll bite (and identify as old . . . school):
Koh-I-noor brand pencil extender doohicky, made quite nicely. German. Ubiquitous in school (90’s . . . ). Lets you get a few extra sheets out of a Prismacolor or Verithin before it got too short to even sharpen. Fits Prismacolors well, but Verithins needed a one-circumference wrap of masking tape to get their diameter big enough for the doohicky to grab it.
I still have at least one.