The Brahmi script for writing Sanskrit is a "modified consonant-syllabic" script. The graphic syllable is its basic unit, and this consists of a consonant with or without diacritic modifications. Since the vowel is an integral part of the consonants, and given the efficiently compacted, fused consonant cluster morphology for Sanskrit words and grammar, the Brahmi and its derivative writing systems deploy ligatures, diacritics and relative positioning of the vowel to inform the reader how the vowel is related to the consonant and how it is expected to be pronounced for clarity. This feature of Brahmi and its modern Indic script derivatives makes it difficult to classify it under the main script types used for the writing systems for most of the world's languages, namely logographic, syllabic and alphabetic.