Pi Day, which falls on March 14, is not just for math nerds anymore. (As you might remember from math class, the mathematical constant π approximately equals 3.14, hence the date of the holiday.) It's now being embraced by the hotel industry -- specifically by The Charles in Cambridge, Massachusetts, in the form of a Pi Day flash sale.

It makes sense that The Charles would take advantage of such a holiday. The luxury hotel is situated on Harvard Square and has been dubbed as “the smart place to stay” -- hosting the brainy likes of former President Bill Clinton, Supreme Court Justices, and even the Dalai Lama in their upscale home-away-from-home-style accommodations. Here, rooms are outfitted with funky custom-designed down quilts, Italian waffle robes, fully stocked refreshments, and fancy EO bath products.

But what’s really smart is that on March 13 -- the day before Pi Day -- the hotel will be offering 31.4 percent off the best available rates across all room categories, valid for travel between March 14 and May 11. With the discount applied, rates will start at $178. Must book between 9 a.m. and 5 p.m. EST directly on The Charles website the day of the sale.