anonymous localhost user in mysql user grant table

[rusty]

What's the purpose of the entry in the user table where it has 
host='localhost' and user='' (blank) and all of the permissions set to N?

In other words, is this some sort of security safety net and it would be 
dangerous to delete it?  Or is it an example of setting up an anonymous 
locahost user and it's safe to delete it?

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