My pet theory is that some people hear words in their heads more than others while reading.  I personally hate reading past stuff that I don&#x27;t know how to pronounce.  &quot;regexp&quot;, &quot;fn&quot;, and the like really bug me.  (&quot;regex&quot;, &quot;fun&quot;, &quot;func&quot; would be my preferred alternatives.)<p>So when I read &quot;kph&quot; I read &quot;kay pea aich&quot; which is pleasing, while &quot;km&#x2F;h&quot; is ambiguous.  Rationally, I prefer &quot;km&#x2F;h&quot;, but I am irresistably drawn towards &quot;kph&quot;.  Seriously -- for me at least, the effect is very strong.