How to get line effect on a shape

[Tabogachi]

I don't really know what this is called so I thought I'd ask here. I'm trying to make this kind of line effect inside a shape, and don't really know where to look or what to do to learn how to do it. Any help is appreciated!

The shape (it's not text)

the effect I want to fill the shape with.

[Bobby Henderson · Accepted solution]

The simplest solution is turning your target shape into a clipping mask.

[Ton Frederiks · Accepted solution]

You could create a horizontal pattern, fill the shape with it and rotate the pattern fill.

[Ton Frederiks · Accepted solution]

[Tabogachi]

Hey, this is great thank you! What font did you use for the T? 

[Ton Frederiks]

Thanks, I just picked a random font, in this case Avenir Black.