Construction: The symbol of the Sun is at the center of the cross at the point of stillness, while the zodiacal signs divided into the four triplicities make up the arms of the cross. The cardinal signs all begin at the center of the cross next to the solar symbol, followed by the fixed and mutable signs. The arms terminate with the elemental symbols of each triplicity. The whole cross represents the center of the universe giving rise to the celestial signs, which then formulate the elements of the physical world (source: Golden Dawn Shop).
History: The swastika (卐 or 卍) is a symbol of divinity and spirituality in Hinduism, Buddhism, and many other Asian, certain European and Native American cultures and religions. It's been around since at least 10,000 B.C.E. and is most commonly associated with good fortune and auspiciousness. The Nazis appropriated the right-facing variant and rotated it 45° (卐). You can read more on Wikipedia.
Symbol issues: Chrome incorrectly shows Emoji for some symbols on certain platforms (e.g. Android), which breaks color and styling (issue #964527)