Did you know that today (3.14) is National Pi Day? First found by San Francisco __Exploratorium physicist__ [1] and “Prince of Pi” Larry Shaw 25 years ago, this holiday is celebrated by number lovers all over the world. Get festive on this geekiest of days by checking out these fun pi products. From a polished pi flask to a cheeky pi perfume (ha!), here are 13 great items to help you get in the mathematical spirit.

Source: __Etsy user Wacodis__ [2]

### iPad Case

Protect your phone in humor using this __Pi iPhone 5 case__ [3] ($38).

### Pi Wall Clock

You'll always know when it's pi o'clock thanks to this fun and simple __pi wall clock__ [4] ($30).

### Pi Flask With Engraved Leather Wrap

It's geeky-meets-classy with this __engraved leather pi flask__ [5] ($21), perfect for a National Pi Day party.

### Scented Pi Soaps

These vegan, __scented pi soaps__ [6] ($5) come in three flavors, including — what else? — apple pi, pumpkin pi, and cherry pi.

### Pi Cologne by Givenchy For Men

Spritz on a holiday-appropriate scent with __Pi Cologne by Givenchy__ [7] ($50) — an infinitely cool cologne with sleek, sophisticated packaging.

### Pi Mug

Give your morning brew a mathematical touch using this __Pi mug__ [8] ($14, originally $15).

### Pi T-Shirt ($25)

Go green and geeky in this playful __pi T-shirt__ [9] ($26, originally $33).

### Handmade Copper Pi Cuff Bracelet

Show some pi pride by wearing this __brass pi cuff__ [10] ($30), which is engraved with the first 144 numbers.

### Pi Pint Glass

Celebrate National Pi Day by pouring your favorite brew into this festive __pi pint glass__ [11] ($15, originally $16).

### Pack of Six Pi Pencils

Ever wish you could memorize part of pi? Do your best by using this __pi pencil pack__ [12] ($8) and reading the numbers while you work.

### The Joy of Pi

Learn all about pi, from its history to our cultural obsession, in David Blatner's __The Joy of Pi__ [13] ($12, originally $14).

Love __this poster's__ [14] ($14-$21) fun take on the move **Life of Pi**.

This __pi bottle opener__ [15] ($30) is sure to get friends talking when you bust it out.