Manuscript Preparation, Copyediting, and Proofreading

Q. The paper I am editing has five tables in the main body (which I am numbering 1 to 5) and one table in appendix 3. How should the table in the appendix be numbered?

A. You could call it table A.1 or A1, or you might consider leaving it unnumbered.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]