Home Assistant users should already be familiar with Yaml, at least those of us who’ve been using it for a while 
I noticed that as well, after looking at the output from their ls command 
I also learned that the zsh shell seems to require the + to fill the space, unlike bash, which I believe works by using quotes.
zsh
/dev/zvol/APPLICATIONS+/vm
bash
"/dev/zvol/APPLICATIONS /vm"
Of course, there are escape characters as well, but I tend to stay away from those unless absolutely necessary.