All Octicons
x-circle-fill
Octicon sizes navigation
React
import {XCircleFillIcon} from '@primer/octicons-react' <XCircleFillIcon size={12} />
Rails
<%= render(Primer::Beta::Octicon.new(:"x-circle-fill", size: :xsmall)) %>
Jekyll
{% octicon x-circle-fill height:12 %}
Figma
This icon is called x-circle-fill-12
in Primer's Octicons library.