I just saw a weird shortcut in dconf-editor:<Primary><Alt>KP_EndWhat is <Primary>?I also saw an Above-Tab key. I completely understand what that is referring to, but were are those key names defined?
What is  for a key?
gnome;keyboard shortcuts
<Primary> is a gtk+ thing.gtk+ 2.24.7 & gtk+ 3.2.1 introduced the concept of a platform-agnostic accelerator modifier, <Primary>, which can be used instead of <Control>:a new facility is provided in Gtk+ (as of this writing it is in Git for Gtk+-2.24, and released in Gtk+-3.2.0) to use the <Primary>  descriptor in place of <Control> for accelerators and bindings. This  will map the accelerator to Command on OSX and to Control for anything  else.1As per this commit:gtk: allow to specify accelerators in a platform-independent way. Introduce <Primary> in accelerator strings, which resolves to  GDK_CONTROL_MASK on X11/Win23, and to GDK_META_MASK on quartz.it is defined (along with other accelerators) in gtkaccelgroup.cgtk_accelerator_name (guint accelerator_key,                     GdkModifierType accelerator_mods){  static const gchar text_release[] = <Release>;  static const gchar text_primary[] = <Primary>;  static const gchar text_shift[] = <Shift>;  static const gchar text_control[] = <Control>;  static const gchar text_mod1[] = <Alt>;  static const gchar text_mod2[] = <Mod2>;  static const gchar text_mod3[] = <Mod3>;  static const gchar text_mod4[] = <Mod4>;  static const gchar text_mod5[] = <Mod5>;  static const gchar text_meta[] = <Meta>;  static const gchar text_super[] = <Super>;  static const gchar text_hyper[] = <Hyper>;<Above_tab> is a window manager thing.As per this commit in metacity:  We want switching between the windows of an application to be an easily accessible operation. The convenient and memorable keybinding  is the key above the tab key - but the keysym for that key isn't  consistent across different keyboard layouts. Add code that figures  out the key from the XKB geometry and a magic keysym name Above_Tab  that refers to this key and switch the default binding for cycle_group  to Above_TabSee also this commit in mutter and source files meta-accel-parse.c and meta-accel-parse.h 