That sounds like an index to me, and the operation surely indexing.<p>I mean, if one has a hashmap<p><pre><code>    hash = {&quot;foo&quot;: 1, &quot;bar&quot;: 2}
</code></pre>
we say hash[&quot;foo&quot;] is an indexing operation, and &quot;foo&quot; is an index. Seems the same to me.