The thesis presented by researcher Hanadi Ali Kazim included three chapters (the cognitive references of the letters of meaning in the Arabic dictionary, the scientific field of the letters of meaning in the Arabic dictionary, and the original and secondary meaning of the letters of meaning in the Arabic dictionary).

The study aims to investigate the opinions of linguists on the meanings of the letters of meanings, then clarify their cognitive references, determine the science in which they are studied, and clarify their meanings in the Arabic dictionary.
The researcher concluded that the grammatical reference is the most present in the Arabic dictionary, and that the field of studying the letters of meanings in the Arabic dictionary is grammatical, and linguists have addressed it in their dictionaries, and that some letters have several meanings, one of which is original and the rest of the meanings are secondary, and some letters carry a common meaning