The iconic radiation warning symbol, known as the trefoil, was first doodled in 1946 by a research group at the University of California, Berkeley, aiming to represent activity radiating from an atom. Interestingly, some believe its design was inspired by the Japanese Rising Sun Flag, reflecting the symbol's radiating lines Make your bike one-of-a-kind with a custom headset cap: Available in 14 vibrant anodized colors Permanent laser-etching Crisp, grayish-white text/graphics Crafted from lightweight yet strong 6061 aluminum Fits 1 1/8" steerer tubes. Measures 1 1/4" (32mm) wide Compatible with most mountain, road, and BMX bikes Easy installation with a 5mm hex wrench Add a bolt to complete your custom headset cap design (sold separately) Fast production & shipping from Ohio A great gift for any cyclist!
