Dal segno?

[Alasdair McAndrew]

When I search on "da capo", "dal segno" I get a huge amount of explanatory 
material in the Lilypond glossary, but I can't find examples of their use, 
or a description of their symbols.  I'm sure it's there somewhere ... but 
so far I can't find where.
How do I insert a "DC al fine" or "Dal Segno" or similar in a score?

Thank you all,
Alasdair

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