Numbers & symbolism fascinate me merely because I see certain ones everywhere- particularly 1, 3, 7, 12.
In the Bible, with the woman clothed with the sun (having a garland of 12 stars), & in literature.. for example, Dante's Beatrice and the descent through the spheres, the 12 soul lights, the 7 terraces of Purgatory... also... I see it a lot in Rosicrucianism.
We see this 1, 3, 7, 12 along the concentric petals in the center of the cross. So what does it actually mean? I have no idea. I'm still trying to figure it out.
However, beyond influence of the Bible, we even see this concept in nature. Going along with the trinity, alpha omega, whichever quantity you want to use... just these different aspects all creating a singular God... We can compare it to light rays, for example. When all seven wavelengths of light are combined, they create one. White light. The prism which refracts light into 7 rays, might be comparable to the "sky" god created to separate light from darkness.
This idea exists sans Bible, so that's why I think there's importance to it.
It's true significance I'm not sure of, but how often I see it occurring makes it curious to me.
When you begin to notice that the symbolism in religion corresponds to occurrences in nature, science & religion seem to become one.