To help the visually impaired judge the heat level when cooking, this gas stove knob departs from traditional ones by indicating heat levels with tactile changes. When rotating the knob to increase heat level, spiral grooves under the knob’s surface surfaces to create an unevenness. A blind person will be able to feel the changes that correspond to the heat levels. The higher the heat level, the more the protuberance. Heat level marks on the surface of the knob also make it easy for ordinary use.