Strange notation...

[EjeLJ]

Hi all,
I downloaded a chart with these symbols in a text line...

``√√¢Π€`√

Can anyone tell me what they are meant for? I'm thinking they may be some private rhythm code someone made up for their own benefit, but if it's some standard I'd love to be on the same page.

Thanks!

[pdxdjazz]

Your guess is most likely correct.
)BOB