When it comes to synonyms for the phrase "is the mark," there are several options to consider. One possible alternative is "is the target," which conveys a similar sense of aiming for a specific outcome or objective. Another choice could be "is the goal," which emphasizes the desired end result of a particular endeavor. Additionally, "is the objective" or "is the aim" could be viable options, both of which imply a clear intention or purpose. Ultimately, the choice of synonym may depend on the specific context in which the phrase is being used and the nuances of meaning that the writer or speaker wishes to convey.