If a package’s name begins with @, then it is a scoped package. The scope is everything in between the @ and the slash
@scope/project-name
How to Initialize a Scoped Package
To create a scoped package, you simply use a package name that starts with your scope.
{
"name": "@username/project-name"
}
More details, Please visit scoped package
and
What does “@” symbol mean in “import { Component } from ‘@angular/core’;” statement?