守恆

conservation (e.g. of energy, momentum or heat in physics) / to remain constant (of a number)

to guard / to defend / to keep watch / to abide by the law / to observe (rules or ritual) / nearby / adjoining

surname Heng

permanent / constant / fixed / usual / ordinary / rule (old) / one of the 64 hexagrams of the Book of Changes (䷟)

conservation law (physics)

conservation of energy (physics)