Behar is the metre of the poem. This can loosely thought of as the length of the sher. Both the lines of a sher must be of the same `behar` or `metre`. Also, all the ashaar of a gazal must be the same behar.
The rhyming pattern of the word (s) just before the radeef in the second line of a sher. This is a necessary requirement, followed even in the absence of other rules.
This is the first sher of a Gazal , and both lines of the sher must end in the radeef. Usually a Gazal has only one matla. If a Gazal has more than one matla, then the second matla is called `matla-e-saani`.
A shayar usually had a pen-name under which he wrote.the pen-name is called `taKhallus`.the sher in which the taKhallus is included is called the maqta. It is the last sher of the Gazal.