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 ...

Greek letters had been used to name storms only once before, in 2005, another busy hurricane season that produced Hurricane Katrina, among others.