Niterra (日本特殊陶業株式会社, formerly known as NGK Spark Plug) is a company that manufactures ceramic products. It offers plugs, sensors, semiconductor packages and manufacturing equipment, piezoelectric ceramics, balls for bearings, oxygen concentrators, sterilization deodorizers, as well as cloud services for checking vehicle health. The company caters to the mobility, information-communication, medical, industry, and innovation markets.