Language: In this image you can see all of the Farsi letters and all 4 of their forms.There are 32 letters in the Farsi alphabet, but unlike our alphabet each letter is written differently depending on where it is in a sentence.This means if you were to learn to write in Farsi, you would have to memorize 32 letters x 4 forms to know how to write Farsi and that would equal 128 different characters to memorize!
~Families of Writing Systems~ Another way to classify writing systems is by "family". This classification can get a bit fuzzy. "Family" can denote a group of writing systems that either have evolved from a common ancestor or have similar "style" or appearance. An example of this latter definition would be Old Persian, which looks like cuneiform but isn't directly descended from Summerian or Akkadian.