While this is loosely graphic-design related, when doing design for some kind of annotations, one have to work with symbols used as 'reference markers', such as
1 in foo 1. When you need to discuss the decisions regarding these, you may want to use a distinctive word.
But how are, or should, these be called? These are usually numbers, however, this won't make them different from exponents; and saying 'numbers' is not very distinctive when the content body is dealing with or using numbers, too. They could be referred as numbers in the upper index or superscript, however, they not essentially need to be a superscript (especially if you try to experiment with something new in your design). In some cases 'reference markers' as numbers can also be a bad idea, eg. annotating a math text.
How should these be called? Numbers? Numbers in the superscript? Reference-mark symbols? Annotation symbols? Is there a term for these?