The ancient form of the character "班" was like a knife between two pieces of jade, indicating to separate a jade with a knife. The original meaning of the verb "班" was "to separate". Later it became a noun and measure word, meaning a group of people. "班" used to refer to a military unit "squad", and now students at school are also divided into "班" (meaning "class"). Separated workers are also called "班", which means "shift". So the current meaning of the character "班" is an organization of people for the purpose of work or study.
上班（shàngbān）：go to work
Wǒ shàngbān de dìfang lí wǒ zhù de dìfang hěnyuǎn.
My workplace is far away from where I live.
Tā shì wǒmen de bānzhǎng.
He is our class monitor.
Jīntiān shéi zhíbān?
Who is on duty today?