@atoponce In Vim it's a `:vsplit` because the split between the panes is vertical.

I tmux it's a `:split-window -h` because the “new” pane is placed horizontally next to the “old” one.

It took me a solid year of my early nerd career to isolate those notions in my brain.

@atoponce i think vim is wrong about this.

i have the tmux splits mapped to "-" and "|", so i don't have to think about that.

and because i use tmux, i rarely need or want vim's :vsplit. i almost always use :split.