It’s arguably the most highly celebrated irrational number, approximately equal to 3.14159 and it is a homonym for one of the most delicious things in the world.

Also, today is the day we celebrate it.

That’s because on March 14 – 3/14, get it? – is National Pi Day, a real holiday established by Congress in 2009.

The day has also become an excuse to celebrate the delectable dish that’s as American as baseball and … well, apple pie.

Michelle Mascaro, owner of Happy Apple Pie Shop, 226 Harrison St., is celebrating the day with a deal — $3.14 for a slice of pumpkin pie. That’s limited to five slices per customer. Apple crumble and chocolate chess pie is also available but for the regular price of $5, Mascaro said.

Mascaro said it is the third year Happy Apple has offered the special – the first year they were overwhelmed with the response.

She said pie lovers have been coming in all morning, some of them from local schools, Mascaro said.

One teacher from a local elementary school stopped in for mini pies for some of her students as a fun way to talk about math, according to Mascaro.

Happy Apple is going to be slinging pies all day – they close at 7 p.m. or until they run out of pies, Mascaro said.

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