What does this expression a[b] represent in C#
<p>I have often seen this expression in a maintenance code</p>

<pre><code>Global["Name"]
</code></pre>

<p>What does this represent? I have used <code>Global.Name</code> but never <code>Global["Name"]</code>?</p>

<p>Is there are a place where this type of expression is used?</p>
