It's an arrow. 
Next time you'll say the Eiffel tower is a phallic symbol.
@Uncle, yeah the modder says this: "Her hair does get a bit wonky when she does leaping shot and other crazy moves. It also clips a bit through her scarf when she moves her head. (I can see why the devs gave her a short cut.)"
It's the reason that the closest you get to long hair in the game is a small pony tail. They'd have to completely re-work the hair part of the game engine, and I don't think lower end PCs and last-gen consoles would be able to handle it at all.
Apparently Sera just likes my human, no reservations or anything. This is weird.
They could still probably have better hair options than they do though.
Agreed. They certainly could've included a greater variety of shorter styles...
One of the biggest issues is that they switched to Frostbite 3. DA2 on (the then latest version of) Eclipse had gotten to the point where they had some hair animation, which is why DA2 has the best hair options of the series. Frostbite was developed as a first/third person shooter, and was never meant to support complex character details like hair, eyes, eyelids, lashes, and toes (to name a few). BioWare was forced to add all this support (and more) into FB3 for DA:I. It's a wonder we got any of what we did. Don't expect much more in the next game.