<iron-icons>
iron-icons is a utility import that includes the definition for the iron-icon element, iron-iconset-svg element, as well as an import for the default icon set.
See: Documentation, Demo.
Usage
Installation
npm install --save @polymer/iron-icons
 
In an HTML file
<html>
  <head>
    <script type="module">
      import '@polymer/iron-icon/iron-icon.js';
      import '@polymer/iron-icons/iron-icons.js';
    </script>
  </head>
  <body>
    <iron-icon icon="search"></iron-icon>
  </body>
</html> 
In a Polymer 3 element
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {html} from '@polymer/polymer/lib/utils/html-tag.js';
import '@polymer/iron-icon/iron-icon.js';
import '@polymer/iron-icons/iron-icons.js';
class ExampleElement extends PolymerElement {
  static get template() {
    return html`
      <iron-icon icon="search"></iron-icon>
    `;
  }
}
customElements.define('example-element', ExampleElement); 
Contributing
If you want to send a PR to this element, here are the instructions for running the tests and demo locally:
Installation
git clone https://github.com/PolymerElements/iron-icons
cd iron-icons
npm install
npm install -g polymer-cli 
Running the demo locally
polymer serve --npm
open http://127.0.0.1:<port>/demo/ 
Running the tests
polymer test --npm