The meaning of ”YA-SIN”. Its detailed explanation is given below.
The Discussion of the Individual Letters :
The individual letters in the beginning of some Surahs are among those things whose knowledge Allah has kept only for Himself. This was reported from Abu Bakr, `Umar, `Uthman, `Ali and Ibn Mas`ud. It was said that these letters are the names of some of the Surahs. It was also said that they are the beginnings that Allah chose to start the Surahs of the Qur’an with.
The Letters at the Beginning of Surahs:
If one removes the repetitive letters, then the number of letters mentioned at the beginning of the Surahs is fourteen: Alif, Lam, Mim, Sad, Ra, Kaf, Ha, Ya, `Ayn, Ta, Sin, Ha, Qaf, Nun.
Moreover, the scholars said, “There is no doubt that Allah did not reveal these letters for jest and play.” Some ignorant people said that some of the Qur’an does not mean anything, (meaning, such as these letters) thus committing a major mistake.
The scholars did not agree on one opinion or explanation regarding this subject. Therefore, whoever thinks that one scholar’s opinion is correct, he is obliged to follow it, otherwise it is better to refrain from making any judgment on this matter. Allah knows best.
These Letters testify to the Miraculous Qur’an:
The wisdom behind mentioning these letters in the beginning of the Surahs, regardless of the exact meanings of these letters, is that they testify to the miracle of the Qur’an. Indeed, the servants are unable to produce something like the Qur’an, although it is comprised of the same letters with which they speak to each other. This opinion was mentioned by Ar-Razi in his Tafsir who related it to Al-Mubarrid and several other scholars. Al-Qurtubi also related this opinion to Al-Farra’ and Qutrub. Az-Zamakhshari agreed with this opinion in his book, Al-Kashshaf.
In addition, the Imam and scholar Abu Al-`Abbas Ibn Taymiyyah and our Shaykh Al-Hafiz Abu Al-Hajjaj Al-Mizzi agreed with this opinion. Al-Mizzi told me that it is also the opinion of Shaykh Al-Islam Ibn Taymiyyah. KAz-Zamakhshari said that these letters, “Were not all mentioned once in the beginning of the Qur’an. Rather, they were repeated so that the challenge (against the creation) is more daring. Sometimes, one letter at a time was mentioned, such as Sad, Nun and Qaf. Sometimes two letters were mentioned, such as
(Ha Mim) (44:1) Sometimes, three letters were mentioned, such as,
(Alif Lam Mim (2: 1)) and four letters, such as,
(`Alif Lam Mim Ra) (13:1), and
(Alif Lam Mim Sad) (7:1).
Sometimes, five letters were mentioned, such as,
(Kaf Ha Ya `Ayn Sad) (19:1), and;
﴿حـم – عسق﴾
(Ha Mim. `Ayn Sin Qaf) (42:1-2).
This is because the words that are used in speech are usually comprised of one, two, three, four, or five letters.”
Every Surah that begins with these letters demonstrates the Qur’an’s miracle and magnificence, and this fact is known by those well-versed in such matters. The count of these Surahs is twenty-nine.