[RSS Feed/News] bdi in template?

[XenForo]

What does <bdi> do?

sample context:
Code:

<xf:if is="$reactionId">
                                    <xf:reaction id="{$reactionId}" small="true" showtitle="true" appendtitle="{$total|number|parens}" />
                                <xf:else />
                                    <bdi>{{ phrase('all') }}</bdi> {$total|number|parens}
                                </xf:if>

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