To find the symbol for pi and have an easier time typing it on your iPhone, you'd have to add the Greek keyboard to your mobile device.Here's how: Launch the Settings app. Go to General. Select ...

Instead, this letter has its origin in an ancient Greek symbol called a 'Christogram'. According to the expert, the nickname emerged from a long-forgotten joke about Jesus' initials.

While consensus is that the tariff formula's use of fancy Greek symbols served little purpose—other than to look fancy—there is still the question of where the formula came from in the first place.