You know what it looks like… but what is it called?
TAKE THE QUIZ“shrdlu”
We have one entry that includes the term shrdlu.
etaoin shrdlu
noun: a combination of letters set by running a finger down the first and then the second left-hand vertical banks of six keys of a Linotype machine to produce a temporary marking slug not intended to appear in the final printing
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Merriam-Webster unabridged