<mat-icon> some icons do not show (e.g. cellular bars)

[RANSoftRA]

Bug, feature request, or proposal:

Using the component some icons are not being displayed

<mat-icon>signal_cellular_2_bar</mat-icon>

What is the expected behavior?

Icon should be displayed

What is the current behavior?

The icon does not show

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-t4adjm?file=app%2Fapp.component.html

What is the use-case or motivation for changing an existing behavior?

Users expect that all icons in https://material.io/tools/icons/ are supported.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular-CLI: 6.1.4
Material: 6.4.6 (installed via ng add @angular/material)
OS: Windows 10
TypeScript: 2.7.2
Browsers: Chrome v68

[jelbourn]

<mat-icon> provides a way to show icons, but don't include any icons itself; that particular icon is probably in some variant or extended version of the Material Design icon font (I don't actually know myself).

[RANSoftRA]

OK, just found out that the iconfonts have not been updated for a while.

Issue google/material-design-icons#786

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