<p>Go ahead, please!!</p>

<p>I thing your arguments (1 to 5, listed bellow) are very valid. Added arguments 6 and 7.</p>

<ol>
<li>"..pivot seems to be being used for both 'pivotal quantities' and 'pivot tables'"- Check;   </li>
<li>".. I think the 'find similar questions' use of tags is somewhat compromised.." - Check;  </li>
<li>"....make more sense to set up 'pivotal-quantity' and 'pivot-table' tags..." - Check;  </li>
<li>"...perhaps making pivot a synonym of one of them..." - Check;  </li>
<li>"... it's not a heavily used tag (11 times I think)..." - Check;  (this is not a counter argument IMO, but supports the idea it is easier to fix it now).</li>
<li>Glen_b is a experienced user of CV -  Check;</li>
<li>It is weekend and CV's traffic is very slow; - ?</li>
</ol>

<p>Just one comment is that "pivot table" does not seem to be a statistic subject, so it could fit under other tags, for example, <code>excel</code>. <a href="https://stats.stackexchange.com/questions/61563/add-values-from-multiple-columns-in-pivot-table">This</a> is one example.</p>

<p>Proposal:</p>

<p>i) create <code>pivotal-quantity</code>, and make <code>pivot</code> a synonym;<br>
ii) add at the <code>pivot</code>'s tag excerpt (.."do not use this tag for pivot-table");<br>
iii) remove the <code>pivot</code> tag from pivot-table questions, and certifies this questions will have the tag <code>excel</code>;</p>

<p>UPDATE: <strong>Implemented</strong> by @Glen_b, with community approval. </p>

<p>1) Right now -</p>

<p>a) give the ~half-dozen questions that have the pivot tag but aren't about pivotal quantities have the pivot-table tag (thus changing only about five or six tags at once) [done]</p>

<p>b) make a tag wiki for pivot to say it's for pivotal quantities and mentioning the existence of the pivot-table tag [done]</p>

<p>c) make a tag wiki for pivot-table [done]</p>

<p>(at this point, the tag situation is 'stable' in the sense that it's clear to users what to do, if somewhat imperfect)</p>
