What are "H-j" and "H-k"?

[leira]

I'm trying to switch from Kakoune/Helix to Emacs+Moew. I saw this in KEYBINDING_QWERTY.org:

  (meow-leader-define-key
   ;; SPC j/k will run the original command in MOTION state.
   '("j" . "H-j")
   '("k" . "H-k")

What is "H-"? Is it "Hyper-"? What does these 2 keys do? Do they have a default binding in the hosting Emacs?

Thanks~

[snowiow]

Hyper is a modifier key from a lisp machine keyboard and no modern keyboard has this anymore. However you could rebind something you don't use to hyper. This link gives some ideas what could make sense to bind hyper to (f.e. fn on a mac). The other option would be to rebind these with another modifier key, so that you don't depend on the availability of a hyper key.

[leira]

Thanks for the answer!

Besides what hyper key is, what confuses me more is what H-j and H-k do? How do I find out what they do? I know C-h k, but I can't type H-j as I have no hyper key and no intention to create one.

[snowiow]

Ah in this case H-j does what j does in motion mode. Motion mode is the meow mode which is active by default in major modes like magit. To have the same navigation feel like in a normal editor session j,k is set to up and down there by meow.
But in normal emacs you have set something else on j and k in these major modes. So when you now would press H-j in a major mode like magit you would trigger the function which was bound to j originally.