WHATCHAMACALLIT
'(<a href="http://www.j-archive.com/media/2011-06-24_DJ_17.jpg" target="_blank">Jimmy of the Clue Crew shows a diagram on a monitor.</a>)  In the pronunciation of the word "circus", the "U" is an unstressed vowel & is marked with what looks like an inverted "e", called <a href="http://www.j-archive.com/media/2011-06-24_DJ_17a.jpg" target="_blank">this</a>'
a schwa