The classes in Brave New World are named after the first five letters of the Greek alphabet: Alpha, Beta, Gamma, Delta, and Epsilon. Within these five categories, we hear pluses and minuses discussed, and even Alpha Double-Pluses. Their jobs are as follows.
The Alpha caste consists of the leaders and the thinkers. They do all the intellectual work and occupy all the highest-level positions. At a lower level (Alpha-Minus), they are administrators and managers. The Warden of the Reservation is an Alpha-Minus.
The Beta caste performs lower-level managerial and higher-level technical functions. Many of them are women. Mechanics, laboratory technicians, and other skilled workers are drawn from the Betas.
Gammas are top-level servants and semi-skilled workers. The Controller's butler, for instance, is a Gamma. While Alphas and Betas do essentially middle-class work, the Gammas are at the top of the working class.
The Deltas are perhaps the least differentiated of the castes....
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