Thai numerals (Thai: เลขไทย, IPA: lêːk̚ tʰaj) constitute a numeral system of Thai number names for the Khmer numerals traditionally used in Thailand, also used for the more common Arabic numerals, and which follow the Hindu-Arabic numeral system.
The Thai language lacks grammatical number. A count is usually expressed in the form of an uninflected noun followed by a number and a classifier. "Five teachers" is expressed as "teacher five person" khru ha khon (Thai: ครูห้าคน or with the numeral included Thai: ครู ๕ คน.) Khon "person" is a type of referent noun that is also used as the Thai part of speech called in English a linguistic classifier, or measure word. In Thai, counting is kannap (การนับ, lit. 'occasion of respect'); the classifier, laksananam (ลักษณนาม from laksana characteristic, form, attribute, quality, pattern, style; and nam name, designation, appellation.) Variations to this pattern do occur, and there really is no hierarchy among Thai classifiers. A partial list of Thai words that also classify nouns can be found in Wiktionary category: Thai classifiers.