Here are three post options tailored to the most likely meanings: Option 1: The Practical Boating/Outdoor Post
You can use "Flydende nøgle" as a metaphor for flexibility or finding "the key to flow" in life.
If you are writing for people who love the water (sailing, kayaking, or fishing), this is the most common use of the term in Danish—referring to a (floating keychain).
Er din sikkerhed "Flydende" eller fastlåst? 💻🔒 Post: Inden for IT-sikkerhed taler man ofte om vigtigheden af dynamiske eller "flydende" nøgler. I stedet for at bruge den samme statiske adgangskode eller nøgle hver gang, genereres de løbende (on-the-fly) for at beskytte data mod uautoriseret adgang.