Lao Alphabet

The Lao alphabet has 27 consonant letters and 28 vowel sign forms ^[1], plus 4 tone marks and native Lao numerals. This is fewer than Thai's 44 consonants — Lao was simplified to remove redundant letters from the Thai/Sanskrit tradition.

The script is a Brahmic abugida, meaning consonants carry inherent vowels that are modified by attached diacritics.

Lao is spoken natively by approximately 7 million people ^[3] in the Lao PDR. Millions more in Thailand's northeastern Isan region speak a closely related variety, and Lao communities exist in Vietnam, Cambodia, France, the USA, and Australia.

If Isan speakers are included, the total number of Lao/Isan speakers exceeds 20 million.

Lao and Thai are closely related members of the same Tai-Kadai language family ^[2], sharing roughly 85% of core vocabulary. They are mutually intelligible in writing and to a significant degree in speech.

The Lao script derives from the same Khmer-based source as Thai script. Historical and political factors led to their development as separate standard languages despite their close relationship.

Standard Lao has six distinct tones ^[1]: mid, low, falling, high, rising, and high rising. Tone is determined by three interacting factors: the consonant class, whether the syllable is live or dead, and any tone mark written above.

This system makes Lao tonal reading more complex than languages where tone is marked directly and independently of other letter features.

Despite their common origin, Lao and Thai scripts differ in several ways ^[1]:

• Fewer consonants — Lao has 27 vs. Thai's 44; Lao removed redundant letters

• No vowel shortening marks — some Thai vowel distinctions are omitted in Lao

• Letter shapes — while similar, Lao letters are generally simpler and more rounded

• Fewer tone marks — Lao uses 4, Thai uses 5 (mai taikhu in Thai has no direct Lao equivalent)

No — Lao is written without spaces between words ^[1]. Spaces appear between phrases, clauses, or sentences — a characteristic shared with Thai, Khmer, and other Brahmic scripts of Southeast Asia.

Readers recognise word boundaries from their knowledge of the language's morphology and syntax, not from visual word separation.

Lao has its own traditional numeral set (໐ ໑ ໒ ໓ ໔ ໕ ໖ ໗ ໘ ໙) ^[1], descended from the same ancient Brahmi numeral system as Arabic numerals. They are used in traditional contexts, religious texts, and some government documents.

In everyday life, commerce, and digital media, Western Arabic numerals (0–9) are widely used alongside or instead of Lao numerals.

Lao is the sole official language of the Lao People's Democratic Republic ^[3]. It is the language of government, law, media, and education at all levels, with the Ministry of Education and Sports mandating Lao-medium instruction nationwide.

While Laos is home to over 80 ethnic groups speaking dozens of languages, Lao serves as the unifying national language for all official communication.