Removing erroneous directory entries: help needed

[Adele Ponty]

One of the users on our system managed to create an entry
in one of our user_data directories that appears at the top
of the directory listing as,  -k@  .  A long listing reveals 
it to be some sort of link they attempted to create;
l---------  -k@   ...  ...  -k@ -> df
I don't know how they managed this but can someone tell me how
to get rid of it?  I have a feeling that I may see more of these.
Thanks.
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