Final answer:
William Gibson coined the term cyberspace in his 1984 novel 'Neuromancer', describing a virtual space existing alongside the physical world. Additionally, Guglielmo Marconi is known for inventing the radio, and Alan Turing for developing the Enigma decoding machine during WWII.
Step-by-step explanation:
The term cyberspace was coined by William Gibson, an American-Canadian writer. He used the term in his 1984 novel 'Neuromancer' to describe a virtual space where communication over computer networks occurs. This concept popularized the idea of a virtual reality that exists parallel to the physical world.
In response to related trivia questions, the invention of the radio is attributed to Guglielmo Marconi, an Italian inventor known for his pioneering work on long-distance radio transmission. Additionally, the Enigma decoding machine, which played a crucial role during World War II, was developed by the brilliant mathematician Alan Turing. Lastly, the book 'On Death and Dying', outlining the five stages of grief, was written by Elisabeth Kübler-Ross. It's important to learn about these milestones as they represent significant advancements in their respective fields.