There are several synonyms for the word "x's." One common synonym is "marks," as in, "I made three marks to indicate where to cut." Another option is "indicators," which could be used in a sentence like, "I placed five indicators to show where the measurements should be taken." "Crosses" is another synonym for x's, and it could be used in situations like, "The builder marked the spots where the pipes should be with a series of crosses." Finally, "notations" can be used as a synonym for x's, as in, "She used different notations to indicate which sections of the document needed to be revised".
