I've looked all over the Wolfram Documentation and done various searches on the web and this site and I can't find an explanation of the single "@" symbol as a means of applying functions.

It seems to perform as an alternate syntax to the full form of a function. I've used it with my own function definitions and with Length, and it seems to work.

What's unnerving to me is that I cannot find a clear explanation in the documentation, any tips on how to better find this stuff in the documentation would be appreciated. Thank you.

  • 4
    $\begingroup$ reference.wolfram.com/language/howto/UseShorthandNotations.html $\endgroup$
    – Alucard
    Feb 12, 2017 at 16:11
  • 2
    $\begingroup$ More generally, when there is a symbol you don't understand, highlight it and press F1, bringing you to the documentation. In this case, it brings you to Prefix, which is the full name of the @ symbol. $\endgroup$
    – bill s
    Feb 12, 2017 at 16:18
  • 2
    $\begingroup$ @bills Generally, selecting it and pressing F1 works, and opens the documentation page of the corresponding function. But this case is a bit more special. Prefix is not the full name of full form of @. In fact @ does not have a "full form" at all. (f@x) is precisely equivalent to (f[x]) in every case. They parse to the same internal representation. $\endgroup$
    – Szabolcs
    Feb 12, 2017 at 16:53
  • $\begingroup$ Thank you all. I'll get better at searching. $\endgroup$
    – Matt Green
    Feb 13, 2017 at 1:57
  • $\begingroup$ Since this is a duplicate, should I just delete it? I'm not sure what the etiquette is. $\endgroup$
    – Matt Green
    Feb 13, 2017 at 2:11


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