15cm instant noodles likely refers to a small-sized pack or serving of instant noodles, with a length of 15 centimeters, which could be the size of the noodle block or the cup/container itself. Instant noodles are a quick and convenient meal, often packaged with seasoning and toppings. They are typically made from wheat or rice and come in various flavors. The 15cm size suggests a compact or smaller serving, perfect for a quick snack or single meal.