What Does The Term ‘Heavy’ Mean In An Aircraft’s Call Sign?

Often listening to airline radio chatter, particularly to air traffic control, you’ll hear radio transmissions using the term “heavy.” It has a fairly literal meaning, referring to the aircraft’s maximum takeoff weight. But it also indicates something else – the amount of turbulence a plane might leave in its wake.

This is a companion discussion topic for the original entry at https://simpleflying.com/heavy-call-sign/
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The shuttle carrier is totally not a heavy and I’m not sure how this is news.
This should be general knowledge to anyone who likes aviation to be honest.