Sounds like it means that the script is shown in the script menu...
No sorry forgot my silly answer...
That mean that the script was just clicked one time and not modified. So its display is ephemere.
If you click another script, it will disappear.
To keep the script in the tab bar, you have to double click the script or modify it.
Ah, that makes sense. Thanks, Fred! The eye icon represents an ephemeral tab.