issaissämerkintää

The term "issaissämerkintää" does not appear to correspond to a known Finnish word or a widely recognized concept in available references. It may be a misspelling, a very specialized or newly coined term, or a fictional/experimental concept. Could you please provide more context or confirm the intended spelling? For example, is it part of a specific field (linguistics, archival science, software, etc.), or does it have an English equivalent you can share? If you can share a brief description of what the term denotes, I can draft a concise, neutral wiki-style article under 300 words based on that scope.