When discussing approximate or estimated values, we often use the term "rough figure". However, there are other phrases and words that can be used in place of this term. For example, one could use "ballpark estimate" to suggest a general idea or range of a value. "Approximation" can also be used to convey a similar meaning. Other synonyms include "approximate amount", "estimated figure", or "approximate value". Additionally, if discussing a visual representation, one could use "sketch" or "outline" to suggest a preliminary idea. While "rough figure" is a common expression, having a variety of synonyms can enhance communication and help to convey a clearer understanding.