Blank characters The letter on which there is no vowel, zir, pesh, jism or any movement is called empty letter. That letter is written but not read but not read. Yes, that blank letter will be recited, the first letter of which is Zubar and there is no Jazm after it.
In some words, a shushah is added after the standing zabur. This shushah is also written like empty letters, but not read.
If the letter b comes after a non-constant or tanveen, the sound of this tanveen or non changes to the sound of mem. On such occasions, they write a small meme for identification.