Upside down a is ɐ, Latin small letter turned a, U+0250. The 58 rows turn the small letters, the capitals, the digits and the marks, and say which ones the upside down text generator uses.
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Letters that stay, letters that borrow
l, o, s, x and z look the same turned over, and so do H, I, N, O, S, X, Z, 0 and 8. b and q, d and p, n and u, 6 and 9 swap places. Unicode has no turned Q, no turned capital B and no turned 4, 5 or 7, so those borrow: Ό is Greek, ㄣ and ㄥ are Bopomofo letters. The true turned capitals Ʞ and Ʇ only arrived in Unicode 7.0.
Tips
A capital U turned over is ∩, the set sign intersection. A small u turned over is simply n.
For a flipped j the text tool uses ɾ, a phonetic tap letter. A capital J turns into ſ, the long s of old printing.
Unicode also calls ¿ the turned question mark, so it is the upside down one and needs no stand-in.
Questions and answers
What is the upside down y symbol?
⅄, Turned sans-serif capital Y, U+2144, added in Unicode 3.2. The small one is ʎ, Latin small letter turned y, which phonetics uses for a kind of l.
How do you write numbers upside down?
Only 2 and 3 have turned digits, ↊ and ↋, from Unicode 8.0; some base-twelve counting uses them for 10 and 11. The rest borrow: 1 is Ɩ, 4 is ㄣ, 5 is ϛ, 7 is ㄥ. 6 and 9 swap, and 0 and 8 stay.
What is the upside down A called?
∀ is For all, the logic sign read as for every. Unicode also has Ɐ, Latin capital letter turned A, the capital of the phonetic vowel ɐ.
Is there an upside down T symbol?
⊥, Up tack, U+22A5, which Unicode also calls base or bottom; LaTeX writes it \bot. Ʇ is the true turned capital T, and ʇ, the small one, is the phonetic tsk tsk click.
ƃLatin small letter b with topbarU+0183. Upside down g, as the text tool draws it: a b with a bar on top, from the old Zhuang spelling.
ɟLatin small letter dotless j with strokeU+025F. Upside down f, as the text tool draws it. Unicode notes it is typographically a turned f, but better thought of as a form of j.
ɔLatin small letter open oU+0254. Upside down c. Its name says open o, and Unicode notes it is typographically a turned c.
ɾLatin small letter r with fishhookU+027E. Upside down j, as the text tool draws it. In phonetics a quick tap of the tongue.
ɐLatin small letter turned aU+0250. Upside down a, and the one the text tool uses. In phonetics a low central vowel.
ǝLatin small letter turned eU+01DD. Upside down e. A letter of the Pan-Nigerian alphabet, not the schwa, which is a separate character.
ᵷLatin small letter turned gU+1D77. The true turned g, used to transcribe Georgian. Unicode 4.1.
ɥLatin small letter turned hU+0265. Upside down h. It looks like a y with a straight tail.
Show all 58 characters (50 more)
Small letters, continued
ᴉLatin small letter turned iU+1D09. Upside down i, with the dot below the line.
ʞLatin small letter turned kU+029E. Upside down k. Once proposed for a click sound.
ꞁLatin small letter turned lU+A781. Upside down l, the turned small l. The text tool leaves l alone, since a plain l turned over is still an l.
ɯLatin small letter turned mU+026F. Upside down m. In phonetics a high back vowel with unrounded lips.
ɹLatin small letter turned rU+0279. Upside down r. In phonetics a voiced alveolar approximant.
ʇLatin small letter turned tU+0287. Upside down t. In phonetics the tsk tsk click.
ʌLatin small letter turned vU+028C. Upside down v. Unicode also calls it caret or wedge.
ʍLatin small letter turned wU+028D. Upside down w. In phonetics a w said without voice.
ʎLatin small letter turned yU+028E. Upside down y. In phonetics a voiced lateral approximant, a kind of l.
ⅎTurned small fU+214E. The true turned small f, the small letter of Ⅎ. Unicode 5.0, so older devices may show a box.
Capital letters 24
ᗺCanadian syllabics carrier khaU+15FA. Upside down B, as the text tool draws it: a Carrier syllable from the Canadian syllabics.
ᗡCanadian syllabics carrier thaU+15E1. Upside down D, another Carrier syllable.
ԀCyrillic capital letter komi deU+0500. Upside down P, as the text tool draws it: the Cyrillic letter Komi de.
∀For allU+2200. Upside down A, as the text tool draws it: the logic sign for all.
ΛGreek capital letter lamdaU+039B. Upside down V, as the text tool draws it: the Greek capital lamda.
ΌGreek capital letter omicron with tonosU+038C. Upside down Q, as the text tool draws it: an O with an accent. Unicode has no turned Q.
∩IntersectionU+2229. Upside down U: the set sign intersection, which Unicode also calls cap or hat.
ƆLatin capital letter open OU+0186. Upside down C. Named open O, used in African languages, and typographically a turned C.
ƎLatin capital letter reversed EU+018E. Upside down E. Named reversed E, and Unicode gives it the other name turned capital e.
ⱯLatin capital letter turned AU+2C6F. The true turned capital A, the capital of ɐ. Unicode 5.1.
ꞰLatin capital letter turned KU+A7B0. Upside down K, the capital of ʞ. Unicode 7.0, so older devices may show a box. The text tool uses the small ʞ.
ꞀLatin capital letter turned LU+A780. The turned capital L, the capital of ꞁ. Unicode 5.1.
ƜLatin capital letter turned MU+019C. Turned capital M, from the old Zhuang spelling. The text tool uses a plain W instead.
ꞱLatin capital letter turned TU+A7B1. The true turned capital T, the capital of ʇ. Unicode 7.0.
ɅLatin capital letter turned VU+0245. The turned capital V, the capital of ʌ. Unicode 5.0.
ᴚLatin letter small capital turned rU+1D1A. Upside down R, a small capital R turned over.
ſLatin small letter long sU+017F. Upside down J, as the text tool draws it: the long s of old printing.
˥Modifier letter extra-high tone barU+02E5. Upside down L, as the text tool draws it: a tone bar for the highest pitch.
∃There existsU+2203. The logic sign there exists, the same shape as an upside down E.
ℲTurned capital FU+2132. Upside down F. Unicode gives it the other name Claudian digamma inversum.
⅁Turned sans-serif capital GU+2141. Upside down G. Unicode gives it the other name game.
⅂Turned sans-serif capital LU+2142. Upside down L in a plain sans-serif shape.
⅄Turned sans-serif capital YU+2144. Upside down Y, the turned sans-serif capital Y.
⊥Up tackU+22A5. Upside down T, as the text tool draws it: the up tack, which Unicode also calls base or bottom.
Digits 8
ㄣBopomofo letter enU+3123. Upside down 4, as the text tool draws it: the Bopomofo letter en.
ㄥBopomofo letter engU+3125. Upside down 7, as the text tool draws it: the Bopomofo letter eng.
ϛGreek small letter stigmaU+03DB. Upside down 5, as the text tool draws it: the Greek small stigma.
ᄅHangul choseong rieulU+1105. Upside down 2, as the text tool draws it: the Korean letter rieul.
ƖLatin capital letter iotaU+0196. Upside down 1, as the text tool draws it: the capital iota of African alphabets.
ƐLatin capital letter open EU+0190. Upside down 3, as the text tool draws it: the open E of African alphabets.
↋Turned digit threeU+218B. The true turned 3, the digit for 11 in some base-twelve systems. Unicode 8.0.
↊Turned digit twoU+218A. The true turned 2. Unicode notes it as the digit for 10 in some base-twelve systems. Unicode 8.0.
Marks and a face 8
¡Inverted exclamation markU+00A1. Upside down exclamation mark, noted by Unicode for Spanish, Asturian and Galician.
⸘Inverted interrobangU+2E18. The inverted interrobang. Unicode gives it the other name gnaborretni, interrobang spelled backwards.
¿Inverted question markU+00BF. Upside down question mark. Unicode also calls it turned question mark, and notes it for Spanish.
⅋Turned ampersandU+214B. Upside down ampersand, used in linear logic.
⸲Turned commaU+2E32. Turned comma, a phonetic sign for a nasal sound.
⸸Turned daggerU+2E38. Turned dagger. Phonetics uses it for a sound made with the tongue curled back.
⸵Turned semicolonU+2E35. Turned semicolon. Phonetics uses it for a sudden stop in the throat.
🙃Upside-down faceU+1F643. The upside-down face emoji. CLDR lists smile and hehe among its search words. Emoji 1.0.