in the image: the hologram of a single photon reconstructed from raw measurements seen in the left-hand side versus the theoretically predicted photon shape on the right-hand side. Credit: FUW

what is a photon?

is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light.

Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 2.998 x 108 m/s. This is commonly referred to as the speed of light, denoted by the letter c.

funny how throughout the little history we know, symbols are taken and used, later on, if those symbols were used by bad people the negative attachment stays, which is absurd, samples of that as this cross or a swastika, which is as old as 3000 BCE, deeply rooted in Indian religions, including Hinduism, Buddhism, and Jainism, where it is used as a symbol of divinity and spirituality, now the westerns with no knowledge of this believe was a European creation...