The asterisk is among the oldest working marks in this collection, and its name is as literal as they come. It descends from the Greek asteriskos, meaning little star, a diminutive that describes the shape exactly: a small radiant burst of lines. But the mark is far more than a decorative twinkle. It was born to do a specific job of editing, and it has never stopped doing versions of that job since.

Its first known duty was at the Library of Alexandria, the great gathering place of ancient scholarship. There, in the third to second century BC, Aristarchus of Samothrace used the asterisk while working on the manuscripts of Homer. His task was textual: to mark lines that had been wrongly duplicated, copied twice by earlier hands, so that a reader could see where the text had gone astray. The little star flagged the trouble, drawing the eye to a place that needed attention. That makes it one of the oldest editorial marks still on duty today, a symbol with an unbroken record of service stretching back more than two thousand years.

What is remarkable is that it never retired. Where other marks faded, changed meaning, or survived only as curiosities, the asterisk simply kept finding new work. It flags footnotes, sending the reader downward to a note. It marks corrections and stands in for redactions, hiding what should not be shown. In the age of computers it became the wildcard, the character that means anything at all, matching whatever you please in a search. Across every one of these roles it keeps the same essential character: a small mark that says look here, something about this needs your notice. The exhibit treasures the asterisk precisely for this endurance. Most symbols have a golden age and a decline. This one has had a continuous career since the scholars of Alexandria, doing in a modern search box a recognisable cousin of what it did in the margins of Homer, the little star that has never once been out of a job.