Meet the Welsh mathematician who first used the symbol Pi 🏴󠁧󠁢󠁷󠁬󠁳󠁿 The Greek symbol π represents the ratio of a circle’s circumference to its diameter and was first used by William Jones in 1706. The value of π is approximately 3.14 which is why today is #PiDay🎉 📸 peoplescollectionwales #Wales #WelshHistory #Cymru