This would output the variable as literal text.
three: But this doesn't work. *DOOWB
And this would throw an error:
three: *DOOWB But this doesn't work.
YAML supports variables, or repeated nodes. The simplest explanation is that you define something as a variable by preceding it with "&NAME value" and you can refer to it with "*NAME" e.g.:
# YAML
some_thing: &NAME foobar
other_thing: *NAME
Parses to:
{"other_thing": "foobar", "some_thing": "foobar"}