So I wanted the caret exactly as in OWA, so I downloaded office365icons.woff
from
https://owa.example.com/owa/prem/15.1.1913.10/resources/styles/fonts/office365icons.woff
(have to be logged in to do it, so did it through browser) and then, copying the boiled-down style from the website:
@font-face {
font-family: 'Office365Icons';
src: url('/fonts/office365icons.woff') format('woff');
font-weight: normal;
font-style: normal;
}
span.o-icon {
font-family: 'Office365Icons';
font-size: 14pt;
line-height: 21px;
color: #666;
}
And finally:
<span class="o-icon"></span>