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.

pierce the veil is an post hardcore group formed in san diego, california in 2007.
pierce the veil

a diode is an electronic component with two electrodes (connectors) that allows electricity to go through it in one direction and not the other direction.
diode

jean-claude boulard (28 march 1943 – 1 june 2018) was a french politician.

jean-claude boulard