[m2e-users] What is the "sha1 prefix" referred to in the "Add" dialog?

[David M. Karr]

When adding a dependency, the label in the "Add" dialog says "Enter 
groupId, artifactId or sha1 prefix or pattern(*)".  I've gone through 
this dialog billions of times and never really read that label.  What 
exactly is a "sha1 prefix" in this context?
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