What kind of R-group attachment is this?

[Genecks]

I'm reading a book: Art of Drug Synthesis

 

It uses an alinine molecule and an attached R-group, which appears to be on the pi-bonds of the cyclical carbon molecule. I don't know what that represents, at least what kind of bond that represents. I've never seen such a carbon-skeleton framework used before. What does it represent?

[John Cuthber]

It means that the position of the alkyl group (o, m, or p) isn't specified

[CarbonCopy]

As the poster above stated, it's just a shorthand to say that it could be in the ortho, para or meta position.