Final answer:
Sodium hydroxide relaxers are commonly called lye relaxers. Sodium hydroxide, also known as lye or caustic soda, is a strong base used in various industries.
Step-by-step explanation:
Sodium hydroxide, also known as lye or caustic soda, is an inorganic compound with the chemical formula NaOH. It is a strong base that is used in various industries, including the production of sodium salts, detergents, and pH regulation. Sodium hydroxide is highly caustic and should be handled with care due to its potential to cause burns.