Bengali Phonology and Writing System: Sounds, Letters, and Orthography

Fundamentals of Sound and Basic Phonemes

Sound is defined as the smallest unit of any language. In the Bengali language, there are a total of $37$ basic or primary phonemes (moulik dhoni). These sounds are fundamentally categorized into two distinct groups: vowels (sworodhoni) and consonants (byanjondhoni). There are specifically $7$ basic vowel sounds, which are phonetically represented within third brackets as: $[i]$ (ই), $[e]$ (঄), [] (অ্যা), $[a]$ (আ), $[ɔ]$ (অ), $[o]$ (ও), and $[u]$ (উ).

Furthermore, there are $30$ basic consonant sounds in the Bengali language. These are denoted as: $[p]$ (প), $[f]$ (ফ), $[b]$ (ব), $[v]$ (ভ), $[t]$ (ত), $[th]$ (থ), $[d]$ (দ), $[dh]$ (ধ), $[ʈ]$ (ট), $[ʈh]$ (ঠ), $[ɖ]$ (ড), $[ɖh]$ (ঢ), $[c]$ (চ), $[ch]$ (ছ), $[j]$ (জ), $[jh]$ (ঝ), $[k]$ (ক), $[kh]$ (খ), $[g]$ (গ), $[gh]$ (ঘ), $[m]$ (ম), $[n]$ (ন), $[ŋ]$ (঑), $[s]$ (স), $[ʃ]$ (শ), $[h]$ (হ), $[l]$ (ল), $[r]$ (র), $[ɽ]$ (ড়), and $[ɽ h]$ (ঢ়). It is important to note that the use of third brackets in these notations is specifically intended to indicate the phonetic pronunciation of the sounds.

Definitions and Classification of Vowels and Consonants

The distinction between vowels and consonants is based on the mechanism of air passage through the vocal tract. Vowels (sworodhoni) are defined as those sounds that are produced without the air being obstructed at any point within the oral cavity during pronunciation. Conversely, consonants (byanjondhoni) are those sounds where the air undergoes some form of obstruction at various points of the vocal organs or speech apparatus before exiting the mouth.

The System of Letters and the Bengali Alphabet

A letter (borno) is defined as a symbolic representation of a sound. The primary function of a letter is to transform a subject that is heard (auditory) into a subject that is seen (visual). The complete set of letters used in a language is collectively referred to as the alphabet (bornomala). Following the division of sounds, the Bengali alphabet is also divided into two categories: vowel letters (sworoborno), which are the symbols for vowel sounds, and consonant letters (byanjonborno), which are the symbols for consonant sounds.

In the Bengali alphabet, the total number of primary letters is $50$ . These primary letters are divided as follows:

Vowel letters (Sworoborno): There are $11$ vowel letters (অ, আ, ই, ঈ, উ, ঊ, ঋ, এ, ঐ, ও, ঔ).
Consonant letters (Byanjonborno): There are $39$ consonant letters, which include groupings such as the velar (ক, খ, গ, ঘ, ঙ), palatal (চ, ছ, জ, ঝ, ঞ), retroflex (ট, ঠ, ড, ঢ, ণ), dental (ত, থ, দ, ধ, ন), and labial (প, ফ, ব, ভ, ম) series, as well as others like য, র, ল, শ, ষ, স, হ, ড়, ঢ়, য়, ৎ, ং, ঃ, and ঁ.

Beyond these main categories, the Bengali writing system incorporates various secondary symbols, including Kar-borno (vowel signs), Anuborno (allographs/alternative forms), Juktoborno (conjunct letters), and Shonkhyaborno (numerical symbols).

Vowel Signs and Consonant Variants: Kar and Anuborno

Kar-borno (vowel signs) refers to the abbreviated forms of vowel letters. There are a total of $10$ such signs (all vowel letters except 'অ' have an abbreviated form). These signs do not have independent usage; they must be attached to a consonant letter. Depending on the specific vowel sign, it may be placed before, after, above, below, or on both sides of the consonant. A crucial orthographic rule states that if a consonant letter is written without any Kar-borno or a 'hos-chinho' (halant), it is assumed that the inherent vowel sound $[o]$ (অ) is naturally included with that consonant.

Anuborno (allographs) refers to the alternative or specialized forms of consonant letters. This category includes Phola, Ref, and Bornoshonkshep (letter contractions).

Phola: These are abbreviated forms of consonant letters that are attached to the bottom or the right side of another consonant. There are six primary Pholas: No-phola (ন, ণ), Bo-phola (ব), Mo-phola (ম), Jo-phola (য্য), Ro-phola (্র), and Lo-phola (ল).
Ref (্র): This is a specific allograph or alternative symbol for the letter 'Ro' (র).
Bornoshonkshep (Letter contraction): This refers to the process of shortening a letter's form, which is often necessary when writing conjunct letters. Examples include shortened forms of letters like ও, দ, ন, ম, etc. Notably, the letter ৎ (khonda-ta) is an abbreviated version of the letter 'ত', yet it is officially recognized as an independent letter in the Bengali alphabet.

Conjunct Letters: Transparent and Opaque Forms

Juktoborno (conjunct letters) are formed when multiple consonant letters are joined together. These are categorized into two types based on their visual clarity:

Transparent (Swoccho): In these conjuncts, the individual constituent letters are easily identifiable (e.g., ল্গ, ল্ট, ল্ড, ল্প, ল্ফ, চ্চ, চ্ছ, ষ্ট, ষ্ঠ, ম্ফ, স্খ, স্ট, স্ক).
Opaque (Oswoccho): In these conjuncts, the original shapes of the constituent letters change, making them difficult to recognize.

Examples of Opaque Conjuncts include:

ক্ত (ক্ + ত), ক্ম (ক্ + ম), ক্র (ক্ + র), ক্ষ (ক্ + ষ), ক্ষ্ম (ক্ + ষ্ + ম), ক্স (ক্ + স).
গু (গ্ + উ), গ্ধ (গ্ + ধ).
ঙ্ক (ঙ + ক), ঙ্গ (ঙ্ + গ).
জ্ঞ (জ + ঞ), ঞ্চ (ঞ + চ), ঞ্ছ (ঞ + ছ), ঞ্জ (ঞ + জ).
ট্ট (ট্ + ট).
ত্ত (ত্ + ত), ত্থ (ত্ + থ), ত্র (ত্ + র).
ণ্ড (ণ্ + ড).
দ্ধ (দ্ + ধ).
ন্ধ (ন্ + ধ).
ব্ধ (ব্ + ধ).
ভ্র (ভ্ + র), ভ্রূ (ভ + র + ঊ).
রু (র্ + উ), রূ (র্ + ঊ).
শু (শ্ + উ).
ষ্ণ (ষ্ + ণ).
হু (হ্ + উ), হৃ (হ্ + ঋ), হ্ন (হ্ + ন), হ্ম (হ্ + ম).

Numerical Symbols and Practical Exercises

For the purpose of indicating numbers, the Bengali language utilizes ten specific numerical symbols (Shonkhyaborno). These are: $1$ (১), $2$ (২), $3$ (৩), $4$ (৪), $5$ (৫), $6$ (৬), $7$ (৭), $8$ (৮), $9$ (৯), and $0$ (০).

Questions & Discussion

Question 1: How many basic vowel sounds (moulik sworodhoni) are there in the Bengali language?

Response: There are $7$ basic vowel sounds.

Question 2: Which sounds are characterized by air not meeting any obstruction in the oral cavity during pronunciation?

Response: Vowel sounds (sworodhoni).

Question 3: What is the technical term for the symbolic representation of a sound?

Response: A letter (borno).