moon letter

When the definite article is followed by a moon letter, no assimilation takes place.

Although he was not much of a writer, he sent Moon letters.

If this view is correct, this aberrant al- does not follow the sun and moon letters rule.

The sun and moon letters are as follows:

As a result, it was classified as a moon letter and it never assimilates the article.

In Arabic and Maltese philology, the moon letters transcribe peripheral consonants.

The first letter after al- (definite particle) is a so-called moon letter (harf qamari), meaning the word is pronounced lkareem, so it is written this way for the purpose of the ʿArūḍ.