Guaitiao is a Thai word for rice noodles. They are are opaque ribbon-like rice noodles. They are called "gway tee-ow" in Thai, "chow fun" in Chinese, or "ban pho" in Vietnamese. Before cooking - frying or adding to soups, they are pre-soak in warm water to soften. These noodles are used to make Pad Thai
It is also called guay dtiow or kuaitiao