Both of these Greek letters are used in economics as shorthand for factors of elasticity but, in this case, the White House assigned them respective values of 0.25 and 4.

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 ...

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.