sekuntiin
Sekuntiin is a term used in Finnish-language speculative writing and science communication to denote an extremely small unit of time, typically associated with ultrafast phenomena. It is not an official SI unit and there is no universally recognized definition, with values varying by author or context. The word builds on sekunti, the Finnish word for second, and the illative suffix -iin, which in this use is employed more as a stylistic or fictional modifier than a grammatical function.
In common fictional or pedagogical usages, 1 sekuntiin is sometimes defined as a fraction of a second
Origins and reception: Sekuntiin does not have a formal standardization and is largely confined to non-technical
See also: Time measurement, Attosecond, Millisecond, Microsecond, Finnish linguistic usage.