[RSS Feed/News] Can someone explain what the pipe symbol does?

[XenForo]

For example, in "Let's build an add on"

Let's build an add-on - XenForo 2 Documentation ​

xenforo.com

<li>{{ phrase('replies:') }} {$thread.reply_count|number}</li>

What does the | (pipe) symbol do? Is it defining how to format the output?

Similarly:

title="{{ phrase('more_options')|for_attr }}"

for_attr??? Is this documented anywhere?

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