jääki

Could you please clarify what you mean by "jääki"? I’m not finding a widely recognized topic by that exact name. Do you intend it as:

- a Finnish linguistic term or neologism,

- a place (a town or locality),

- a personal name or surname,

- an organization or project,

- a fictional concept or terminology from a specific work?

If you’d like, I can draft a concise, neutral wiki-style article once you specify which sense you have in mind.