Very simple variable question

If this is a simple question why am I asking it? Good question, so you can answer it! :lol:

Just kidding, I need help.
I’m proficient with AS 2.0 from MX and up, but I’ve recently been told to try and decipher an old AS 1.0 format code:

/:currentScore = 100;
    tellTarget("/") {

I totally and fully understand what the code is trying to do.
the variable currentScore of 100 is initialized and the root frame is sent to the “gameover” frame.

Here’s my question, what is that symbol, “/:” doing? Is that the primitive way to assign a “_root.” variable? or is that just a typo?

Few things to note:
The code was commented out.
The code itself doesn’t compile.