A rigger is one who works on ropes, booms, lifts, hoists and the like for a stage production, film, or television show.
In the age of sail, trading followed seasonal patterns with ships leaving port at set times of the year to make the most of winds.
[1] The original canvas backdrops used in the theatre moved with ropes and pulleys, being developed from techniques used for sails.
[2] The term rigger is still used for people backstage in theatres, the road crew for a live concert, conventions and trade shows, and by extension to similar jobs such as those who are responsible for fastening chain motors (like CM Lodestar, EXE Rise, Chainmaster) by wire rope to the structural steel of a building.
Many plays and feature films (e.g. Peter Pan, Harry Potter, Superman) use this technique.