What is an "unmentionable word" to SQL? What is an "unmentionable word" to SQL?

I am reading sys.query_store_query_text (Transact-SQL) and I see the following, so I google {SQL "unmentionable" word}


  has_restricted_text
  bit
  Query text contains a password or other unmentionable words.


Other then 3 links that take me back to where I found it, I don't find anything that appears to show a relationship to a password or anything that SQL might care about.
Changing my answer, as I was incorrect in my previous assertion after testing. I believe this is another way of expressing that the value is either a password or another form of ciphertext (encrypted value) instead of a plaintext value.