The stirrer function : For performing the Weiss Distribution Technique (WDT), which is to stir your coffee grounds around when they're in the portafilter before levelling and tamping, which breaks up clumps and aids an even distribution throughout. For some grinders this is necessary.
The design of handle shape comes from Taiwan “sky lantern”
In a small town of Taiwan , people release “sky lantern” in Lunar Jan/15th.
People pray “luck / health/ lessons / works / love...” and write it on the Sky lantern.