http://images.akamai.steamusercontent.com/ugc/392169906049877862/E20688594FDD7998794FCA93B3427A6088412823/

 

What do the arrows mean? I have no idea how to play this :(

It's a pull-off chord

 

Basically

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-----------10p0---------

-----------10p0---------

ninjad

Here's a little guide of the symbols and techniques in RS2014:

 

http://static2.cdn.ubi.com/ncsa/rocksmith/website/guides/Notehead-tail%20guide.pdf

 

 

Going through some of the lessons in the game will also help you a lot in figuring out what the different symbols mean and how to properly execute the technique.

So at the 10th fret I use my fret hand and pull both strings? What's the use of this? 

Same use as single note pull-of, mostly the fact that you don't want to pluck the string again and to have a more mellow sound because you don't have the power of the attack with a pick.

Thanks for the explanation, first time I came across a song that used pull-off chords of this kind, guess it is a technique often used in Drop-D-songs

Not really.

 

Drop tuning make HO/PO on power chord easy while it's hard to do in standard tuning (even if it's doable).

 

But you can often find HO/PO on chord in many 80's rock song like this one :