There is no common scientific or engineering term called "electromagnetic swing." It's possible you've encountered this term in a fictional context or a specific, niche application.

If you can provide more context about where you encountered this term, I might be able to offer a more specific answer. For example, were you reading a book, watching a movie, or perhaps researching a specific technology?

Here are some possibilities that the term might be related to:

* A fictional device: A "swing" powered by electromagnetism might be a fantastical element in a science fiction story.

* A scientific experiment: Perhaps you're thinking of an experiment involving a pendulum and electromagnets, where the magnetic forces influence the pendulum's motion.

* A niche technological application: The term could refer to a specific application of electromagnetism, such as a magnetically levitated swing for amusement park rides.

Please give me more information about the context, and I'll be happy to help you understand what the term refers to.