[Gygash]

In bash, that's referred to as process substitution[1]; the syntax is only slightly different:

    <(command)

Edit to add: both ksh and zsh support process substitution, too:

    ksh: <(command)
    zsh: either =(command) -- uses a temporary file
             or <(command) -- uses a named pipe

[1]: http://tldp.org/LDP/abs/html/process-sub.html