A paper published in 2016 in Nature Photonics1 by the Faculty of Physics at the University of Warsaw, Poland, explained how a team of physicists discovered that the shape (or the hologram) of a single light photon (a minute particle of light) is that of a solar cross symbol.2
A graphic of this hologram can be seen here.
Today, variations of this particular sun cross symbol, where the four arms expand as they go outwards, are often associated with the Knights Templar or the Maltese orders of Europe, and it is therefore often known as a “Templars’ cross” or a “Maltese cross,” or as a “Cross Pattée / Formée.” Historically, however, this ancient symbol is known to have also been used in more remote times, for example by various cultures in ancient Mesopotamia and by the early Britons in Europe.
(L.A. Waddell, The Phoenician Origin of Britons, Scots & Anglo-Saxons: Discovered by Phoenician & Sumerian Inscriptions in Britain by Pre-Roman Briton Coins & a Mass of New History (London: Williams & Norgate, Ltd., 1924), 294-295, 406.) It has also been found across the ocean in pre-Columbian petroglyphs in the USA.
The use of the solar cross as a religious symbol in antiquity was practically universal, and many variations of this ancient symbol can be found in nearly every culture and continent.3
Symbols have been used by practitioners of the ancient Religion of the Sun throughout time to encapsulate and express various universal principles, such as elements of the process of creation, the relationship between the movement of the earth and the sun, the spiritual path of the sun throughout the year, and so on. This study’s findings draw an interesting connection between the solar cross being the hologram of a unit of light and the Religion of the Sun being a religion of light.
A full description of this study’s findings can be found in a Cosmos Magazine article by Cathal O’Connell, titled “What shape are photons? Quantum holography sheds light”:
Radosław Chrapkiewicz, Michał Jachura, Konrad Banaszek, & Wojciech Wasilewski, “Hologram of a single photon.” July 18, 2016. http://www.nature.com/nphoton/journal/v10/n9/full/nphoton.2016.129.html. Accessed September 29, 2017.
O’Connell, Cathal. “What shape are photons? Quantum holography sheds light.” Cosmos. July 20, 2016. Accessed September 08, 2017. https://cosmosmagazine.com/physics/what-shape-is-a-photon.
“Cross,” The Encyclopedia Britannica (11th edition, 1910) volume 7, page 506. Accessed online on September 8, 2017 via Archive.org.