What are those small bulbs in the aircondition buttons called a 2001 Nissan Altima?

Those small bulbs used in the air conditioning buttons of a 2001 Nissan Altima are called instrument panel bulbs or indicator lights. They are typically small, incandescent bulbs that provide illumination to the various buttons and controls on the vehicle's dashboard, including the air conditioning system. These bulbs help the driver to easily see and operate the air conditioning controls, especially in low-light conditions. When one or more of these bulbs burn out or malfunction, it can make it difficult to see or use the air conditioning controls properly. Replacing these bulbs is a relatively simple task that can be done at home with basic tools and replacement bulbs.