Relational algebra is a fundamental concept in the field of computer science and database management. It refers to a set of mathematical operations used to manipulate data in relational databases. While there are no direct synonyms for "relational algebra", there are several related terms that may be of interest. For example, some people might use the term "database query language" or "relational calculus" to refer to the same basic concepts. Other related phrases might include "structured query language" or "data manipulation language". Ultimately, no matter what you prefer to call it, the key to successfully working with relational databases lies in understanding the core principles behind relational algebra.