I don't have
tree installed, but I get the same effect from
cfdisk. I pasted the output from cfdisk into od (octal dump). These symbols are just multibytes from my locale, which is
This is a vertical bar with a branch to the right, followed by a horizontal continuous line: 342 224 234 342 224 200
This is a down/right corner, followed by the same horizontal:
342 224 224 342 224 200
Go to this URL:
and type in the octal 342 224 224
You would need to Google for "convert Unicode Code Point to UTF-8".
echo -e '\0342\0224\0234\0342\0224\0200'