All Octicons
clock-fill
Octicon sizes navigation
React
import {ClockFillIcon} from '@primer/octicons-react' <ClockFillIcon size={24} />
Rails
<%= render(Primer::Beta::Octicon.new(:"clock-fill", size: :medium)) %>
Jekyll
{% octicon clock-fill height:24 %}
Figma
This icon is called clock-fill-24
in Primer's Octicons library.