What is L and N

Sometimes I see on schematics L and N. I dont know that this is. Sometimes I see it in relation to pic schematics. I dont use pic and dont really know anything about it accept that it is a series of programmable chips often for hobbyists.

Here is an example

I have no intention of building this but just show it here as an one example.

Regards

L = Hot side of your AC line, normally the Black wire. N = Neutral, normally the white wire. this wire is the one that is connected to ground in the US at some given point out side your home, normally on the pole ground and your house ground coming in. the green wire is normally your own supplied ground around your property to insure user and polarity safety.

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Thanks All.

I get it now.

Another diagram is here.

On a 120v AC socket (if the polarity is right), the L is the small rectangle hole and the N is the large rectagle hole. Not to be confused with the 3erd prong which is ground.(green)

Regards