A step-and-repeat is the sponsor-studded banner or wall that serves as a backdrop for photographs at event. This is part of a complete episode.
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The high-tech version of step and repeat are “stepper” machines at the heart of semiconductor fabrication. Every integrated circuit “chip” on every circuit board of every electronic gadget you’ve ever used in the last forty years has been produced by these incredibly precise and expensive machines. Operating at the engineering limits of physics, mechanics, electronics, optics and chemistry, these are arguably the most precise machines used at industrial scale.
See https://en.wikipedia.org/wiki/Stepper