crmr_5   Read access to business unit 5
crmw_3   Write access to business unit 3
crmn_1   Read and write notes access...
[download]

I would do something like:

my $ro_business_unit_5;
my $wo_business_unit_3;
my $rw_notes;
[download]

I would much rather have long variable names that I can absolutely, unambiguously know what they represent, than having to wade through code trying to find the original assignment. To boot, typically if someone is using non-descriptive variable names, they likely are naming functions ambiguously as well, which makes it doubly as hard to sort out the true meaning behind the variable name.

Some people say "I have to type more if I use long variable names!", to which I say, get a better editor/IDE that does variable and function auto-populate. If they don't want to do that, then they can contemplate later down the road how much time they would have saved by typing the long var names as opposed to trying to look through thousands of lines of code figuring out which variable does what six months after they last looked at the code.