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On a Unix-like system with X11 and a compose key, I believe Compose + S + S should work (away from my computer, so can't test).

YEẞ, it workß.

Do tell, which key is this "Compose"?

Depending on your keyboard layout, the key might be the "AltGr" key, or have an Apple logo, an MS logo or a penguin on it.

Thanks for the hint. While neither of those keys seems to be the compose key on my linux, SHIFT + ALTGR + S workẞ here.

I have it set to Caps Lock. GNOME used to (and might still) have a setting for it in its keyboard preferences; I think KDE and Xfce do, too. Otherwise, you can add "setxkbmap -option compose:caps" to your ~/.xsession or ~/.xinitrc (whichever you're using) or to some other startup script.

Some old Unix workstations actually do have a physical "Compose" key on their keyboards. Alas, I do not have such a keyboard, but it ain't like I use Caps Lock all that much anyway.

On Windows, altgr-shift-ß.

on linux: [AltGr]-[Shift]-[S]: ẞ

[compose]-S S also works

actually Capslock + ß, on Fedora at least

both work here (Ubuntu and Arch)