What Is ฤ in Thai? Three Readings, One Glyph
TL;DR: ฤ is a Thai letter that does not appear on the 44-letter consonant chart and is usually left off the vowel chart too. It carries its own vowel, so it is a whole syllable in one glyph, and it has three readings: rue, ri and roe. You will meet it early, in อังกฤษ, and there it takes the second one. Its partner ฦ has two readings and no living words, so it is the one you can safely skip.
The glyph that is on neither chart
Sooner or later you meet ฤ. It usually happens in the word for English, อังกฤษ, which is one of the first nouns anybody learns, and it happens before you have any way to deal with it. The glyph looks like a consonant. It sits in the run of letters like a consonant. So you go back to the 44-letter consonant chart to find it, and it is not there.
It is not on most vowel charts either, which is the part that makes it feel like a printing error rather than a letter. The 32 vowel forms are normally taught as shapes that wrap around a consonant, and ฤ does not wrap around anything. It is the consonant.
The classification that Thai reference works actually use is the second one: ฤ, ฤๅ, ฦ and ฦๅ are treated as vowels. They come from Sanskrit, where they wrote syllabic r and l, sounds that are a consonant and a vowel at once. Thai borrowed the letters along with the words and kept them in that ambiguous slot, where they have sat ever since. Phayan counts ฤ and ฤๅ among its own 32 vowel forms for exactly that reason, and flags both as irregular.
Three readings, and the first word you meet takes the second
The short form ฤ has three pronunciations. That is unusual but not arbitrary, and the distribution is lopsided enough to be learnable.
| Glyph | Read as | Sound | Where you see it |
|---|---|---|---|
| ฤ | rue | /rɯ/ | The default. ฤดู, a season; พฤหัสบดี, Thursday |
| ฤ | ri | /ri/ | อังกฤษ, English; กฤษณะ, the name Krishna |
| ฤ | roe | /rɤː/ | ฤกษ์, an auspicious time. One word, essentially |
| ฤๅ | rue, held | /rɯː/ | The long form. ฤๅษี, a hermit |
อังกฤษ is worth sitting with, because it is the word that will teach you the letter whether you want it to or not. It is written อ ั ง ก ฤ ษ and read ang-krit. The ฤ is doing two jobs at once: it supplies the r that closes the cluster กฤ, and it supplies the vowel that follows it. Six symbols, two syllables, and one of the symbols is a syllable and a half by itself.
How to tell which reading you are looking at
There is no rule that derives it from the spelling, which is a real gap and worth saying plainly rather than dressing up. What there is instead is a very short list. Three things make the guessing cheap:
- Rue is the default. If you have never seen the word before and have to say something, say rue. It is right more often than the other two together.
- Ri lives after a consonant in a cluster. อังกฤษ, กฤษณะ, ทฤษฎี. When ฤ follows a ก or a ท that is clearly starting the syllable rather than ending the one before, ri is the likely reading.
- Roe is one word. ฤกษ์. Learn it as vocabulary and stop thinking about the third reading.
This is the same trade the script makes everywhere. Thai spelling is largely derivable, and the places where it is not are small closed lists you learn as items. The month names are the same shape of problem, and พฤษภาคม, May, is another word with ฤ in it that you will read long before you can spell it.
Where it sits when you look a word up
In a Thai dictionary, ฤ and ฤๅ come after ร, and ฦ and ฦๅ come after ล. That is the practical half of calling them vowels and then filing them like letters: a vowel form has no place in the alphabetical order at all, and these four do, immediately behind the consonant whose sound they carry.
So if you are working through how to look up a word you cannot read, a word beginning ฤ is found at the back of the ร section, not filed under some separate appendix. Most printed dictionaries put a small header there. Most apps do not, which is why a lookup that should take four seconds turns into a scroll.
ฦ is the one you can skip
ฦ and ฦๅ read lue, short and long, and they are effectively dead. They survive in dictionaries and on charts and in almost nothing you will ever read. Phayan leaves them out of its vowel set deliberately, for the same reason it marks ฃ and ฅ as reference-only among the consonants: a chart that claims 44 consonants describes 42 in use, and a learner drilling the other two is spending time on shapes that no longer occur.
ฃ and ฅ have a better excuse than obsolescence alone. Each duplicated a sound another letter already had, and when the first Thai typewriter was built in 1892 there was simply not enough room on the machine for every character, so two redundant ones lost their keys and never got them back. A piece of hardware from the nineteenth century is still deciding what is on the chart you are reading.
What to do with this
Recognise ฤ, read it rue by default, and know that อังกฤษ is the exception you will meet first. That is the whole of it for the first several months. It is not a letter to drill, it is a letter to stop being surprised by, and the difference between those two is most of what makes learning a script feel manageable.
Phayan is an app for learning to read Thai script letter by letter, starting from zero, with audio on every word and your progress kept in the browser without an account. It introduces ฤ and ฤๅ at level 8 as reference material rather than as drill items, positioned after the consonant they attach to, which is the honest place for a glyph that behaves like a letter and is catalogued as a vowel.
Frequently asked questions
What is the best way to learn the Thai letters that are not on the chart?
Learn them as words rather than as letters, because there are only a handful of words and no rule to derive. Phayan introduces ฤ at level 8 alongside the vocabulary that contains it, after the 42 consonants in everyday use are already in place, which is the order that keeps a rare glyph from eating time that belongs to common ones. An Anki deck will hold the same handful perfectly well; what it will not do is tell you which handful is worth building, and that is the only hard part here.
How do I pronounce ฤ in อังกฤษ?
Ri, not rue: the word is ang-krit, with ฤ closing the กฤ cluster and supplying the i after it. This is the single most useful exception on the list, because อังกฤษ is a word you will read in your first month and get wrong for a year otherwise. Phayan carries the word with its Paiboon form beside the Royal Institute one, and the Royal Institute spelling angkrit already gives you the reading if you trust it.
Is ฤ a consonant or a vowel?
A vowel, by the classification Thai reference works use, though it behaves like a syllable rather than like either. It came from Sanskrit letters for syllabic r and it kept that double duty, which is why it carries its own vowel sound and needs no consonant underneath it. Phayan files ฤ and ฤๅ among its 32 vowel forms and marks both irregular, which is the honest compromise: the label does not change how you read the glyph, and the only place it matters is alphabetical order.
What is the difference between ฤ and ฤๅ?
Length. ฤ is short and ฤๅ holds the same vowel longer, the ๅ being the lengthening stroke that appears elsewhere in the script. ฤๅ is rare enough that ฤๅษี, a hermit, is the example every reference reaches for, and it is also the word the consonant ษ is named after. Phayan teaches the short and long pairing across the whole vowel system long before these two arrive, so the distinction is familiar by the time they do.
My chart shows 44 consonants. Am I learning two I will never use?
Yes, and it is worth knowing which two rather than wondering. ฃ and ฅ dropped out of general use and survive in dictionaries and in the count, so the consonant set is 44 on paper and 42 in practice. Phayan marks both as reference-only and drills neither, because you want to recognise them in old printing and you will never have to produce one. ReadThai.Fun lists the full historical set as a reference table if you would rather see every glyph in one place.