sivuttaisia

Could you provide a bit more context for "sivuttaisia"? I’m not certain what subject you want covered. For example, is it a real-world term in Finnish (a group, concept, or location), a historical or cultural topic, a fictional subject, or something from a specific field (religion, politics, linguistics, etc.)? If you can share a source or a brief description, I can draft a concise, neutral wiki-style article (under 300 words).