I think the explanation of stereotype needs a bit of explanation to make sense.
In early printing, a plate would be assembled from individual letters of type before it was used for printing. However, it quickly became apparent that certain words or phrases were used a lot, so typesetters would create "a solid plate of type" for those words or phrases to speed up the typesetting process.
In early printing, a plate would be assembled from individual letters of type before it was used for printing. However, it quickly became apparent that certain words or phrases were used a lot, so typesetters would create "a solid plate of type" for those words or phrases to speed up the typesetting process.