Why the Star of David on the Yellow Badge?

Following is my note to the article about the Yellow Badge in Wikipedia

This entry doesn’t explain why the Nazis designed the yellow badge in the shape of a Star of David and not in any other shape. It also doesn’t describe who decided to design the yellow badge, where and when.
To fill these gaps see: “Under the Nazis the term "yellow badge" first appeared in Robert Weltsch's article "Tragt ihn mit Stolz, den gelben Fleck" ("Wear the Yellow Badge with Pride"), published in the Judische Rundschau on April 4, 1933, in reaction to the anti - Jewish boycott of April 1, 1933. At that point no official Jewish sign was in existence and there were no plans to introduce such a sign. Weltsch was apparently referring to the slanderous and abusive inscriptions painted on the windows of Jewish - owned stores and businesses in "Operation Boycott" of April 1, and the relapse to medieval times that it signified.
The proposal to impose a distinctive mark on the Jews was first made by Reinhard Heydrich at a meeting held in the wake of the Kristallnacht pogrom, in November 1938.

David Koresh flag

Picture of David Koresh flag is copied from Wikimedia Commons. This flag was flown by the Branch Davidians over the Mount Carmel Center during the 1993 Waco Siege. 

Ponto

The collections of the Rio Museo de Policia include a cup with ponto, essentially a Latin cross within a Hexagram within a circle decorated with six minor stars.
Source: webarchaeology.com

Grail Seekers

Brian Kannard wrote on his blog:

Tip Site of the Week:
For all of you interested in Jewish Hexagrams, check out the Star of David blog. These show up in all sorts of places that you might not expect. There’s some nice work and pics on Zeevveez’s blog. He’s also interested in the Templar use of hexagrams, if you have any information or insight on this, email me and I’ll let him know.

So here is what I already collected about this subject:
There are many hexagrams on the ceiling of the Old Templar church of Garway. 

On the arch "of the ceiling of the rock-hewn church of Saint Mary's in Ethiopia.

In Rodez you will find a cathedral with rose windows with the Hexagram. 

Steven Sora speaks about the six-pointed star in his book The Lost Colony of the Templars: Verrazano's Secret Mission to America.

Quanzhou, China

The following news article appeared on the English People's Daily on October 29, 2001

An ancient relievo of the Star of David, which Chinese archaeologists believe may date back to the Song Dynasty (960-1279) or Yuan Dynasty (1279-1368), has been unearthed recently in east China's port city of Quanzhou.
Carved in a piece of white granite that measures 65 cm in height and 63 cm in width and was obviously a component of a building, the relievo takes the form of a six-pointed star, a symbol of Judaism, which remains part of the national flag of Israel.
Archeologists say the relievo and the original relevant architecture indicate the influence of Judaism in the ancient times in Quanzhou, a port city in Fujian province.
The relievo was unearthed under the Deji gate to its ancient city wall.

Genesis sculpture

John Robinson's Genesis sculpture is placed at the Isaac Newton Institute for Mathematical Sciences, Cambridge, U.K. It has three rhombuses. and forms  a three-dimensional hexagram. The sculpture belongs to Robinson's Universe Series, which he began in 1975.

Keynsham, England

Dr . Steve Cosh referred me to six large hexagrams that had been found in room J/K Keynsham, Bristol, England. I went to the Rockefeller Museum library and saw on MOSAIC Vo. 25, 1998 p. 12 a painting of this mosaic, made by S.R. Cosh, The hexagram lines are made in the shape of Guilloche. Between each two points there is a swastika. Above the left upper hexagram there’s a cross. The six hexagrams fill the floor of a hexagonal room and encircle a hexagon that serves as a frame for a six petalled flower. This kind of a hexagram mosaic that fills a whole room reminds me of the 3rd century Roman room full of hexagrams in Villa Romana del Casale in the town of Piazza Armerina in Sicily; only there each hexagram is a frame to a bust.

Following is an excerpt from Dr. Steve Cash’s email to me:

There are many interlaced squares in Romano-British mosaics but very few interlaced equilateral triangles(hexagrams). The only ones I can cite are from Keynsham, Bristol, England. It is a grand villa with rooms of hexagonal plan at either end. One has a scheme of hexagons, six of which surrounding the central hexagon contain hexagrams. I assume that this is because of the shape of the room and the usual interlaced squares have been adapted on a purely geometric basis. The mosaic also features Medusa and is probably early fourth century.
Reference:
Mosaic no II, 204.5 in Cosh SR and Neal DS 'Roman Mosaics of Britain
Vol II South-west Britain' 2005.