Thai: ไชโป๊ว (chai-poh)
Pickled Radish is preserved with salt, and is usually bought pre-chopped into fine bits. I believe it’s made from Daikon radish, but I’m not totally sure. It’s thrown into Pad Thai as well as eaten with Rice Soup.
Storage: Pickled Radish is preserved already, so if you store it in the fridge it should last a very long time.