There is
some confusion over this term as it has also
been used to refer to oriental rugs in
general. The country known as Persia changed
its name to Iran in the 1920s, but by that
time the term 'Persian' had become something
of a generic name for any hand-made pile rug
from the Near East. Rugs from Iran are still
often referred to as Persian.
Differences in design and type of Persian
rugs can be attributed to the region and
period from which they were made. There are
distinct divisions between rugs made in
urban and rural areas, and those woven by
nomadic tribes. These differences are
further characterised by the cultural
traditions of the rug making area from which
they derive. For example, rugs from Isfahan
(central Iran) typically exhibit 250-600
knots per square inch, sometimes have a silk
foundation and often depict hunting scenes,
whereas those hailing from Kerman, to the
south-east, usually yield 140-300 knots per
square inch, are made from a higher quality
wool, and often contain a deeper pile.