[Haskell-beginners] What does "(# #)" mean?

[John M. Dlugosz]

On 4/5/2014 10:31 AM, Christopher Allen wrote:
>
> Search I used to get your answer:
> http://symbolhound.com/?q=tuple+%28%23+%23%29+Haskell

Thanks.  That is more helpful than "sure it works!".  I had tried searches like
<http://symbolhound.com/?q=%28%23>

Since Emanuel was confused by my meta-quoting of syntax in prose, is there some (other) 
standard that's used in this mailing list when using plain text without markup?

It's not just Google, BTW.  I can't search PDF files either.  The search bar on 
www.haskell.org itself gives "no results" and other things (I forget what) have even given 
syntax error!