Supplement usually refers to a magazine, such as science magazine, mathematical exchange magazine, etc. If it is a semi-annual report in ........................................................................................................................................................., there will be 24 issues. This is normal publishing.

If the author's contribution is large and of high quality, one or two issues (more formal) can be added after consultation and approval by the editorial board of his magazine, then the words (supplement) must be marked for the added publications to show that they are different from normal publications. For example: Mathematical Communication (Supplement).