How to safely highlight folder names in Linux?

Question

linux

Previously used this
[COOL]
But then I met a situation where my application did not resolve this path with square brackets.
How to write a folder name without surprises?
These options are gone.

COOL
C O O L
!COOL

It is desirable that the name be conspicuous even when sorting, all the folders designated in this way are grouped in a row. Well, there were no conflicts at all. System - Ubuntu 16.04

Answer 1

Prefix 00_ or just folder 00, in which all this is collected.