The "<" and ">" characters in Spotlight are reserved operators for earlier or later than qualification. For example, any HTML files created before a date:
kind:html created:<11/01/2025
or after a date:
kind:html created:>11/01/2025
For document types that support a Spotlight size, one can use those comparison operators to find files that are less than or greater than a given size. Or one can isolate PDF documents for instance whose pages are greater than 50.
Because Spotlight searches are case-insensitive and do not permit wildcards, even a partial string should find the containing document if unique, or documents if otherwise. That can reduce the complexity of the search string.