halo is a weapon to destroy all life in the galaxy so that the flood will die off.
A halo is a religious symbol that signify's purity, a icon in religion. For example a Saint would have a halo, some sign of innocence. So a sword through a halo would signify that the innocence and purity is broken, out of existence and completely vanished.
it is the symbol for the 7th column- a fansite for the halo community
Christ
In chemistry, the symbol "" signifies a positive charge on an ion or a molecule.
Awesomeness
In Greek mythology, the dove is a symbol of the goddess Aphrodite. However, normally, a white dove is considered a symbol of peace.
The halo around Jesus' head is called a "halo" or "nimbus." It is a symbol of holiness and divinity in Christian art.
i.e.
Halo
When someone is depicted with a halo over their head, it typically signifies that they are considered holy, divine, or spiritually enlightened in religious art and iconography.
It's an early Christian symbol (if that's what you mean, the question is a bit unclear for me). It is supposed to signify Christ.
The "" symbol in a chemical equation signifies the combination of two or more reactants to form a single product.