When it comes to identifying synonyms for "top line," there are a few good options to consider. For example, some might prefer to use the phrase "revenue stream" instead, as this term more closely aligns with the financial side of a business. Another synonym that could work well is "sales figures," which specifically refers to the number of units sold or the amount of money generated through sales. "Gross income" is another similar term that can be interchangeable with "top line," as it refers to the total economic value generated by an organization or individual. Ultimately, the term you choose will depend on the context in which you are using it and the meaning you want to convey.