View source for What does ampersand mean in yaml

It creates a yaml anchor, which allows you to duplicate / inherit content.

<pre>
# YAML also has a handy feature called 'anchors', which let you easily duplicate
# content across your document. Both of these keys will have the same value:
anchored_content: &anchor_name This string will appear as the value of two keys.
other_anchor: *anchor_name
</pre>
<ref>https://learnxinyminutes.com/docs/yaml/</ref>