Pilots flying under instrument flight rules (IFR) make a practice of recording instructions from air traffic control (ATC), usually with pencil and paper. Pity the poor pilot who lost their pencil to the cabin floor and can’t retrieve it because the seat belt and shoulder harness are tight and the plane is flying through turbulence while ATC is issuing an amended route clearance.
The blue double ended thingy sturdily clips onto both the plane control stick and standard sized pencils.
I’ve started giving them to other fumble fingered pilots.
You know who you are. Just ask the next time we see each other.
For RV deprived pilot friends, I also have a version that clips onto standard aviation chromalloy 3/4″ tubeing.