Unknown syntax [[:Book:{{{Pages}}}|Pages]] and the purpose thereof

I saw an expression, which looks like an AngularJS expression on a web site recently and I’ve been trying to find out exactly what the purpose of it is, by trying to replicate this in NG, but it doesn’t seem to do anything.

The syntax was similar to:


Has anyone seen a syntax like this and know what it represents?

Source: syntax

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