Is there a word or phrase that describes old articles published again?

Two commonly used terms:

Reprint

From the Archives

They are republications

OED:

3. a. The action of publishing a work again; the fact of being republished.

1995 Wired June 200/2 Electronic publishers should allow anybody to republish their materials, provided that republication takes place by means of a pointer to the original document.

b. A new publication of a work; a work that has been published again.

1796 W. Withering Arrangem. Brit. Plants (ed. 3) I. Pref. 5 This may rather be regarded as a new work than as a re-publication of an old one.

2002 N. Nicolson Fanny Burney vii. 108 Fanny Burney's name suffered only intermittent eclipse, and in recent years it has shone again with the republication of all her novels.

Another approach is to feature articles from a specific milestone year(s) and even specific month in the past. Scientific American does this.

ENGINEERING: 50, 100 & 150 Years Ago: February 2021

This approach and style of rubric/issue naming is fascinating for technology and the sciences, where progress is so fast.

In addition to a regular magazine, journal, or newspaper feature taking this approach, anthologies are sometimes published separately:

The Washington post: The first 100 years