Answer:
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
A hole in a pole, though I fill a hole in white. I'm used more by the day, and less by the night.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard.
What word looks the same upside down and backwards?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?