There are many different types of bacteria, and each one has its own scientific name. Within the scientific classification system for organisms, bacteria are in the Monera kingdom. Members of this group lack a true nucleus.
Each individual bacterium has a scientific name. According to the University of Oregon's Department of Pathology, most bacteria can be categorized as one of three shapes; "coccus" refers to spherical bacteria, "bacillus" refers to rod-shaped bacteria, and spirillum refers to spiral bacteria.
Some bacteria live alone, while other types are grouped. Bacteria in aggregates are categorized based on the arrangement; "diplo" refers to a set of two, "strepto" refers to a chain, and "staphylo" refers to a cluster.
Other parts of bacteria names come from the area of the body affected. For example, "pneumo" refers to the lungs, so Streptococcus pneumoniae refers to spherical bacteria that are grouped in chains and affect the lungs, also known as pneumonia.