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newbie forgot what the & means

I have a script that is using the apersand and I have for got what it does to a variable in an array. Here is the line <B>&$book</B>

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@NogDogFeb 10.2014 — The specifics depend on the context, but generally it has to do with references.
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about: ({
version: 0.1.9 BETA 6.16,
whats_new: community page,
up_next: more Davinci•003 tasks,
coming_soon: events calendar,
social: @webDeveloperHQ
});

legal: ({
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changelog: (
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notes: added community page

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version: 0.1.7,
notes: upvote answers to bounties

version: 0.1.6,
notes: article editor refresh
)...
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