Leaving HDMI PC sticks aside, we started to see really small, pocket-sized Intel mini-PCs last year with ECS LIVA Q2 micro PC with a dual-core N4100 Gemini Lake processor and measuring 70x70x33.4 mm.
CHUWI managed to design an even smaller Gemini Lake Mini PC with Larkbox mini PC powered by a Celeron J4115 quad-core processor and measuring 61x61x43mm (2.4" x 2.4" x 1.7"). It looks like they may have launched a new 2.4-inch Mini PC form factor, as at least two other models with pretty much the same dimensions, but different specifications, have come to our attention.