But punctuation rules might be very different, e.g. in Spanish ordinal numerals are supposed to have a dot to denote that it’s a contraction: 1.º

Nowadays this seems to die down, but it still is in the rules:

Entre el número y la letra volada debe haber un punto.

There must be a period between the number and the superscript letter.

www.rae.es/buen-uso-español/los-ordinales