Lesson : Sukun or Jazm: Joining two letters
When a syllable ends in a consonant, the consonant is free of all vowels. In Arabic, this is represented by means of a special symbol atop the letter. This symbol is called a sukoon and the letter which holds this symbol is called saakin. Therefore, the letter 'M' in the word 'FROM' would be transliterated with a sukoon atop the letter 'meem'. Only the sound of the letter would be pronounced just as we pronounce the sound of the letter 'M' when we recite this word.
Remember that a syllable is not a word. Therefore, saakin letters can occur in the middle or at the end of a word.