Removing Serial Number from table

Hello;
I do not need to display the serial number in the table (child document). How?

Regards
Bilal

Its default feature.
if you want to hide you can add own app css or custom script as $(".sortable-handle").hide() in refresh event.

e.g.
frappe.ui.form.on(“DOCTYPE”, “refresh”, function(frm) {
$(“.sortable-handle”).hide()
});

For custom script http://frappe.github.io/erpnext/user/manual/en/customize-erpnext/custom-scripts/custom-script-examples/

Fine I will try it the custom script, but I would to know what it means the $(“.sortable-handle”)?
In other words, why we used the $ sign and the .? It’s shape little bit strange. I would to know the meaning.
Regards
Bilal

@bghayad This is jquery selector.
Please check this for your reference :

https://api.jquery.com/class-selector/