Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Q: leslie grantham (30 april 1947 – 15 june 2018) was a british actor and convicted murderer.

A: leslie grantham
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Q: the viol (rhymes with "mile") is a string instrument that is played with a bow.

A: viol
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Q: moment of inertia (formula_1), also called "angular mass" (kg·m), is the inertia of a rotating body with respect to its rotation.

A:
moment of inertia
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