Here's a quick over view & files for the Harry Potter Crest with the four house logos I laser cut for my sister.
Step 1: Getting the File to the Correct Format for the Laser Cutter
The laser cutter I have access to is from a Hackerspace called Noisebridge which only accepts .dxf files
DXF means Drawing eXchange Format used to open a graphical image to be opened in CAD programs
Here's a link to how the laser cutter is used at Noisebridge:Laser Manual
Attached is a preview of how the symbol looks as well as the .dxf .svg file for all you laser cutting enthusiasts!
I also added a handful of files.
I cut my symbols on 3mm White Acrylic