Nonnet

A Nonnet is a type of poem which has the following requirements:

For e.g. Akhil Katyal's poem 'How to write a Nonnet!':

Hear hear, this is what a nonnet is
begin with 9, then with each line,
cut a syllable every time
by the 4th line, it's 6
by the 5th, it's 5
and as you dive
my hon', your
nonnet's
done!