A "quota system" refers to a system that sets limits on the number or percentage of people or things that are allowed to be included or used in a particular situation. There are several different synonyms that can be used to describe this type of system. One alternative term is "allocation system," which has a similar meaning to quota but is less specific. Another synonym is "limitation system," which includes the idea of setting boundaries or restrictions. "Rationing system" is another term that could be used, which implies the allocation of limited resources. Other possible synonyms could include "distribution system," "proportion system," or "quota allocation system".