On the Windows version it always used to be '@' as well, but for some reason, in prereleases (or at least some of them) this doesn't work by default. For example, in the last prerelease with NotEye, it's in fact bound to Alt+q. This gives me the shivers, because it's very similar to Shift+Q (apart from inconvenient).
It would be good for this command to be standardized to the '@' we all know and love in all versions and systems, especially taking into account that casual users won't edit configuration files.