Euro Bulb = More tip coverage lower on the knot. The shape is made resemble the bulb shape made common by the likes of Thater and Shavemac.
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This is the second knot I am buying from AP Shave Co. The first was the Cashmere. All knots are of excellent quality. I installed the badger knot in Razo Rock Bruce handle because I like the shape of that particular handle, and now the brush looks and feels like the most expensive brushes manufactured by Shavemac or Thater for fraction of the price. I highly recommend this knot!
Just grabbed another 24mm Gelousy knot for a vintage brush restoration project. They have nice density, no crazy glue bump, and some incredible tip softness. I really have been impressed with them and reccomend them highly.