Vulgar fractions are typically described as fractions that have not been reduced to their simplest form and can be written as a ratio of two integers. However, there are several synonyms for "vulgar fraction" that you may come across in mathematical literature. Some of these include common fraction, simple fraction, or improper fraction, depending on the context. Each of these synonyms refers to a fraction that is written as one integer divided by another, regardless of whether it has been simplified. It's important for students and mathematicians to understand these different terms, as they may come across them in different mathematical fields and contexts.