First off, gather your materials. You need fleece, matching thread, needle, pins, fabric scissors, and a marker.

I recommend sewing by hand, as it gets narrow at some parts, but that's entirely up to you.

Trace the symbol into the fleece.
I found a nice picture of it on my laptop, zoomed to the size I wanted, and traced it onto the fleece from the screen. If you do it this way, I suggest clipping it in some way, to keep from slipping.

Fold the fleece over, so that when you cut, you can get the mirror image of the traced image. Pin it together, fairly tightly so that it does not slip.

Cut it out!
After you cut, you need to decide how you want to sew this. I used very tight overcast stitches, very close to the edge of the fleece. If your going to do this, bring the right side out, and re-pin it.
If your going to try to sew by sewing machine or want to do the sewing and pull it inside out, leave it as is, but make sure you will be able to flip it out.

Start sewing! If your doing an overcast stitch, without doing the flipping it inside out, make sure you stuff as you go. Start with the narrow pieces, leaving the body at the end so that you can have room to stuff.

Voila! Your done!

(the smaller symbol is my necklace, I did not make it, it is just there for effect)