Many Warsies know, for example, about what the Rebellion Alliance Starbird symbol stands for:
It is the symbol of resurrection in the form of a Star Wars analogue of a phoenix, as the Rebellion strives to resurrect the Republic and everything good it stood for (That, and Galen Marek).
The Galactic Republic symbol:
According to Wookiepedia, this originally belonged to the Bendu - which was "a collection of non-confrontational beliefs practiced by the Bendu monks." The symbol of Bendu represented the unification of the galaxy by the Force. The Republic later adopted it as a symbol. The number of eight holds great meaning for some reason. The Sith curiously have a similar one :
as a symbol, though the meaning is lost to me. So does it mean a galaxy united by the Dark side of the Force or something?
The Jaing Head of the Mandalorians:
Being a clan-based, war like people with a system that values honor, this predatory symbol reflects strength and aggression. But there's probably a deeper meaning behind it.
I don't know much about the other symbols. CIS symbol, for example. Can anyone here explain that, and perhaps share your own interpretation behind the other symbols?
Edit: Sorry about the size of the symbols.