"“I was wondering if it was evil or stupid,” New York University Law Prof. Christopher Sprigman said. “I realized I didn’t have to decide — it’s both.”
No corporation could force pi to stand in for their brand like the swoosh does for Nike, because it’s already part of the everyday language, he said — people see the symbol and think of the math constant, not Ingrisano’s clothes.
“Trademark law is a dangerous thing,” Sprigman said. “It gets taken too far a lot, and this is one of those cases.”" Read more » about Brooklyn entrepreneur says he's receiving death threats for using the pi symbol to brand his clothing line