Camera Quick Release Plate

I don't know what this tiny strange quick-release plate is. I can't find anything like it anywhere on the internet and ended up having to print one.

 Name                           Last modified      Size  Description
 Parent Directory                                    -   
 camera-screw-odd.jpg           2019-02-01 18:23   84K  Extra-short screw this plate needs.
 odd-screw.jpg                  2019-02-01 18:23   84K  Extra-short screw this plate needs.
 camera-plate.gif               2015-10-15 11:42   23K  Mounting dimensions from actual camera spec
 quickrelease-2.jpg             2019-02-01 11:33  205K  Unknown camera tripod bracket
 quickrelease-3.png             2019-02-01 11:24  6.7K  Unknown camera tripod bracket
 quickrelease.dxf               2019-02-01 11:22  156K  Unknown camera tripod bracket
 quickrelease.jpg               2019-02-01 11:32  154K  Unknown camera tripod bracket
 quickrelease.scad              2019-02-01 11:37  4.6K  Unknown camera tripod bracket
 quickrelease.stl               2019-02-01 11:27  548K  Unknown camera tripod bracket