When chaos ends, I remain. Born from battle or sums, I mark what's left behind. Not the fight, but the shadow it casts. What single word names me?

I can be water, I can be wood, I'm used in mathematics and with dinner I'm good.

I am an odd number Take away a letter, and I become even What number am I?

I twist and turn, yet never flee, I hold your secrets, yet set them free. I’m found in your thoughts, or locked away tight, Unscramble me, and I’ll bring insight.

Composed of pairs identical that total up to four Where half are lines a bit offset, connected up and shored The other half are vertices acute, obtuse, or square A quadrilateral that with eleven trait is shared