Michael Haggerty wrote:

    git symbolic-ref -m "Create @ alias for HEAD" @ HEAD

I find this very interesting.  I already have a symbolic ref H
pointing to HEAD, but it has some quirks: H@{u} complains that H is an
invalid branch for example.  When I create the symbolic-ref @, I'm not
_exactly_ creating a synonym for HEAD: @{u} works, not @@{u}.

Many people are confused by this patch (reflog? HEAD@ versus master@?
incomplete due to { omission?), and I'm not sure HEAD@ or master@ are
even useful.  This confusion can be avoided completely if the patch
has the exact same effect as symbolic-ref'ing @ to HEAD.