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Back when this embiggener was hosted free on replit (repl.co, rest in peace replit.com Free Hosting Golden Era) it was able to fully document this feature through a page saved with a large amount of input and linked at the bottom of the tool itself. My current host is getting grouchy about this link that is 30000 characters long. I can see why Cloudflare finds it suspicious or outside of its acceptable parameters. I'm a busy and lazy so here's the original input. Because you can't look up at the input and compare the output, especially with the beginning demonstration of words and math, I went through and interpreted the output and pasted it below what would be used to make that output as input. I might rewrite this garbled mess later, sorry.
To use RFC1345 digraphs (like vim's ^k command), use the secret parameter rfc1345 with the value of what you want the prefix to be. Make it something you aren't going to type. You can't use "=" or "&", probably others. Just be warned, the easier you make your prefix key the more likely it will come up unintendedly. On the line below I'm putting a deliberate space between "/" and "sc" because otherwise it would render as /sc example: with the option "rfc1345=/" set (as this page does), you can type some math / science equations with ease: /D*d/-:/D*t = velocity distance=/RT(x/2s-x/1s)/2S (y/2s-y/1s)/2S yields Δd÷Δt = velocity distance=√(x₂-x₁)² (y₂-y₁)² You can type characters used in many languages: ba/n?o /aangstr/o:m wei/ss /a+//+/l+/s+/3+//+/l+//+/a+/m+/'+ /e+//+/l+//+/y+/k+/'+/m+ /a5/ri/ga/to/u5 /Ma/Ku/Do/Na/Ru/Do /Sh/L+/W+/M% /E+/L+/J+/K+/M% /h*/a%/n*/a*/t*/o*/*s dovi/d/enja /d=/o=/v=/i=/d%/e=/nj/a= yields baño ångström weiß اَلسَّلَامُ عَلَيكُم ありがとう マクドナルド שלום עליכם θάνατος doviđenja довиђења /BD/dR/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/dL/FD Also box drawing! /FD/uR/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/HH/uL/BD yields ╲┍━━━━━━━━━━━━━━━━━━━┑╱ Also box drawing! ╱┕━━━━━━━━━━━━━━━━━━━┙╲ This page is a list of the digraphs for your convenience. Out of the ASCII control characters I have only implemented tab. The RFC1345 document provides the following mnemonics that help with generalizing some codes. You can always just look up the digraph for the character you want, but these help: Exclamation mark ! Grave Apostrophe ' Acute accent Greater-Than sign > Circumflex accent Question Mark ? tilde Hyphen-Minus - Macron Left parenthesis ( Breve Period . Dot Above Colon : Diaeresis Comma , Cedilla Underline _ Underline Slash / Stroke Quotation mark " Double acute accent Semicolon ; Ogonek Less-Than sign < Caron Zero 0 Ring above Two 2 Hook Nine 9 Horn Equals = Cyrillic Asterisk * Greek Percent sign % Greek/Cyrillic special Plus + smalls: Arabic, capitals: Hebrew Three 3 some Latin/Greek/Cyrillic letters Four 4 Bopomofo Five 5 Hiragana Six 6 Katakana Additional note: Hiragana is two lowercase letters, Katakana is the first uppercase. There are many little patterns like this. Alternative US-ASCII HT:\t SP: Nb: # DO: $ At: @ <(: [ //: \ )>: ] '>: ^ '!: ` (!: { !!: | !): } '?: ~ Latin-1/ ISO 8859-1 NS: !I: ¡ Ct: ¢ Pd: £ Cu: ¤ Ye: ¥ BB: ¦ SE: § ':: ¨ Co: © -a: ª <<: « NO: ¬ Rg: ® 'm: ¯ DG: ° +-: ± 2S: ² 3S: ³ '': ´ My: µ PI: ¶ .M: · ',: ¸ 1S: ¹ -o: º >>: » 14: ¼ 12: ½ 34: ¾ ?I: ¿ A!: À A': Á A>:  A?: à A:: Ä AA: Å AE: Æ C,: Ç E!: È E': É E>: Ê E:: Ë I!: Ì I': Í I>: Î I:: Ï D-: Ð N?: Ñ O!: Ò O': Ó O>: Ô O?: Õ O:: Ö *X: × O/: Ø U!: Ù U': Ú U>: Û U:: Ü Y': Ý TH: Þ ss: ß a!: à a': á a>: â a?: ã a:: ä aa: å ae: æ c,: ç e!: è e': é e>: ê e:: ë i!: ì i': í i>: î i:: ï d-: ð n?: ñ o!: ò o': ó o>: ô o?: õ o:: ö -:: ÷ o/: ø u!: ù u': ú u>: û u:: ü y': ý th: þ y:: ÿ Latin Extended-A A-: Ā a-: ā A(: Ă a(: ă A;: Ą a;: ą C': Ć c': ć C>: Ĉ c>: ĉ C.: Ċ c.: ċ C<: Č c<: č D<: Ď d<: ď D/: Đ d/: đ E-: Ē e-: ē E(: Ĕ e(: ĕ E.: Ė e.: ė E;: Ę e;: ę E<: Ě e<: ě G>: Ĝ g>: ĝ G(: Ğ g(: ğ G.: Ġ g.: ġ G,: Ģ g,: ģ H>: Ĥ h>: ĥ H/: Ħ h/: ħ I?: Ĩ i?: ĩ I-: Ī i-: ī I(: Ĭ i(: ĭ I;: Į i;: į I.: İ i.: ı IJ: IJ ij: ij J>: Ĵ j>: ĵ K,: Ķ k,: ķ kk: ĸ L': Ĺ l': ĺ L,: Ļ l,: ļ L<: Ľ l<: ľ L.: Ŀ l.: ŀ L/: Ł l/: ł N': Ń n': ń N,: Ņ n,: ņ N<: Ň n<: ň 'n: ʼn NG: Ŋ ng: ŋ O-: Ō o-: ō O(: Ŏ o(: ŏ O": Ő o": ő OE: Œ oe: œ R': Ŕ r': ŕ R,: Ŗ r,: ŗ R<: Ř r<: ř S': Ś s': ś S>: Ŝ s>: ŝ S,: Ş s,: ş S<: Š s<: š T,: Ţ t,: ţ T<: Ť t<: ť T/: Ŧ t/: ŧ U?: Ũ u?: ũ U-: Ū u-: ū U(: Ŭ u(: ŭ U0: Ů u0: ů U": Ű u": ű U;: Ų u;: ų W>: Ŵ w>: ŵ Y>: Ŷ y>: ŷ Y:: Ÿ Z': Ź z': ź Z.: Ż z.: ż Z<: Ž z<: ž Latin Extended-B O9: Ơ o9: ơ OI: Ƣ oi: ƣ yr: Ʀ U9: Ư u9: ư Z/: Ƶ z/: ƶ ED: Ʒ A<: Ǎ a<: ǎ I<: Ǐ i<: ǐ O<: Ǒ o<: ǒ U<: Ǔ u<: ǔ A1: Ǟ a1: ǟ A7: Ǡ a7: ǡ A3: Ǣ a3: ǣ G/: Ǥ g/: ǥ G<: Ǧ g<: ǧ K<: Ǩ k<: ǩ O;: Ǫ o;: ǫ O1: Ǭ o1: ǭ EZ: Ǯ ez: ǯ j<: ǰ G': Ǵ g': ǵ Spacing modifier letters ;S: ʿ '<: ˇ '(: ˘ '.: ˙ '0: ˚ ';: ˛ '": ˝ Greek A%: Ά E%: Έ Y%: Ή I%: Ί O%: Ό U%: Ύ W%: Ώ i3: ΐ A*: Α B*: Β G*: Γ D*: Δ E*: Ε Z*: Ζ Y*: Η H*: Θ I*: Ι K*: Κ L*: Λ M*: Μ N*: Ν C*: Ξ O*: Ο P*: Π R*: Ρ S*: Σ T*: Τ U*: Υ F*: Φ X*: Χ Q*: Ψ W*: Ω J*: Ϊ V*: Ϋ a%: ά e%: έ y%: ή i%: ί u3: ΰ a*: α b*: β g*: γ d*: δ e*: ε z*: ζ y*: η h*: θ i*: ι k*: κ l*: λ m*: μ n*: ν c*: ξ o*: ο p*: π r*: ρ *s: ς s*: σ t*: τ u*: υ f*: φ x*: χ q*: ψ w*: ω j*: ϊ v*: ϋ o%: ό u%: ύ w%: ώ 'G: Ϙ ,G: ϙ T3: Ϛ t3: ϛ M3: Ϝ m3: ϝ K3: Ϟ k3: ϟ P3: Ϡ p3: ϡ '%: ϴ j3: ϵ Cyrillic IO: Ё D%: Ђ G%: Ѓ IE: Є DS: Ѕ II: І YI: Ї J%: Ј LJ: Љ NJ: Њ Ts: Ћ KJ: Ќ V%: Ў DZ: Џ A=: А B=: Б V=: В G=: Г D=: Д E=: Е Z%: Ж Z=: З I=: И J=: Й K=: К L=: Л M=: М N=: Н O=: О P=: П R=: Р S=: С T=: Т U=: У F=: Ф H=: Х C=: Ц C%: Ч S%: Ш Sc: Щ =": Ъ Y=: Ы %": Ь JE: Э JU: Ю JA: Я a=: а b=: б v=: в g=: г d=: д e=: е z%: ж z=: з i=: и j=: й k=: к l=: л m=: м n=: н o=: о p=: п r=: р s=: с t=: т u=: у f=: ф h=: х c=: ц c%: ч s%: ш sc: щ =': ъ y=: ы %': ь je: э ju: ю ja: я io: ё d%: ђ g%: ѓ ie: є ds: ѕ ii: і yi: ї j%: ј lj: љ nj: њ ts: ћ kj: ќ v%: ў dz: џ Y3: Ѣ y3: ѣ O3: Ѫ o3: ѫ F3: Ѳ f3: ѳ V3: Ѵ v3: ѵ C3: Ҁ c3: ҁ G3: Ґ g3: ґ Old Church Slavic zX: Ꙁ zY: ꙁ OY: Ѹ oy: ѹ oX: Ꙋ oY:ꙋ wX: Ѡ wY: ѡ tX: Ꙡ tY: ꙡ OV:Оѵ ov: оѵ JI: Ꙑ ji: ꙑ aX: Ꙗ aY: ꙗ jX: Ѥ jY: ѥ iX: Ѭ iY: ѭ eX: Ѧ eY: ѧ yX: Ѩ yY: ѩ kX: Ѯ kY: ѯ pX: Ѱ pY: ѱ xX: Ѻ yY:ѻ 1X: Ꙩ 1Y: ꙩ from ꙩко eye 2X: Ꙫ 2Y: ꙫ from ꙫчи eyes 4X: Ꙭ 4Y: ꙭ from ꙭчи eyes 3X:Ꚙ 3Y:ꚙ from двꚙе two ꚙбо both ꚙбанадесять twelve двꚙюнадесять twelve 7X: ꙮ from серафими многоꙮчитїй many-eyed seraphim 5X: Ꚛ 5Y: ꚛ from ꚛкрест around, in the region of Hebrew A+: א B+: ב G+: ג D+: ד H+: ה W+: ו Z+: ז X+: ח Tj: ט J+: י K%: ך K+: כ L+: ל M%: ם M+: מ N%: ן N+: נ S+: ס E+: ע P%: ף P+: פ Zj: ץ ZJ: צ Q+: ק R+: ר Sh: ש T+: ת ,+: ، ;+: ؛ ?+: ؟ Arabic H': ء aM: آ aH: أ wH: ؤ ah: إ yH: ئ a+: ا b+: ب tm: ة t+: ت tk: ث g+: ج hk: ح x+: خ d+: د dk: ذ r+: ر z+: ز s+: س sn: ش c+: ص dd: ض tj: ط zH: ظ e+: ع i+: غ ++: ـ f+: ف q+: ق k+: ك l+: ل m+: م n+: ن h+: ه w+: و j+: ى y+: ي p+: پ v+: ڤ gf: گ 0a: ۰ 1a: ۱ 2a: ۲ 3a: ۳ 4a: ۴ 5a: ۵ 6a: ۶ 7a: ۷ 8a: ۸ 9a: ۹ :+ : ◌ً "+ : ◌ٌ =+ : ◌ٍ /+ : ◌َ '+ : ◌ُ 1+ : ◌ِ 3+ : ◌ّ 0+ : ◌ْ aS: ◌ٰ Latin Extended Additional B.: Ḃ b.: ḃ B_: Ḇ b_: ḇ D.: Ḋ d.: ḋ D_: Ḏ d_: ḏ D,: Ḑ d,: ḑ F.: Ḟ f.: ḟ G-: Ḡ g-: ḡ H.: Ḣ h.: ḣ H:: Ḧ h:: ḧ H,: Ḩ h,: ḩ K': Ḱ k': ḱ K_: Ḵ k_: ḵ L_: Ḻ l_: ḻ M': Ḿ m': ḿ M.: Ṁ m.: ṁ N.: Ṅ n.: ṅ N_: Ṉ n_: ṉ P': Ṕ p': ṕ P.: Ṗ p.: ṗ R.: Ṙ r.: ṙ R_: Ṟ r_: ṟ S.: Ṡ s.: ṡ T.: Ṫ t.: ṫ T_: Ṯ t_: ṯ V?: Ṽ v?: ṽ W!: Ẁ w!: ẁ W': Ẃ w': ẃ W:: Ẅ w:: ẅ W.: Ẇ w.: ẇ X.: Ẋ x.: ẋ X:: Ẍ x:: ẍ Y.: Ẏ y.: ẏ Z>: Ẑ z>: ẑ Z_: Ẕ z_: ẕ h_: ẖ t:: ẗ w0: ẘ y0: ẙ A2: Ả a2: ả E2: Ẻ e2: ẻ E?: Ẽ e?: ẽ I2: Ỉ i2: ỉ O2: Ỏ o2: ỏ U2: Ủ u2: ủ Y!: Ỳ y!: ỳ Y2: Ỷ y2: ỷ Y?: Ỹ y?: ỹ Greek Additional ;': ἀ ,': ἁ ;!: ἂ ,!: ἃ ?;: ἄ ?,: ἅ !:: ἆ ?:: ἇ General Punctuation 1N: 1M: 3M: 4M: 6M: 1T: 1H: -1: ‐ -N: – -M: — -3: ― !2: ‖ =2: ‗ '6: ‘ '9: ’ .9: ‚ 9': ‛ "6: “ "9: ” :9: „ 9": ‟ /- † /=: ‡ ..: ‥ ,.: … %0: ‰ 1': ′ 2': ″ 3': ‴ 1": ‵ 2": ‶ 3": ‷ Ca: ‸ <1: ‹ >1: › :X: ※ '-: ‾ /f: ⁄ Superscripts and Subscripts 0S: ⁰ 4S: ⁴ 5S: ⁵ 6S: ⁶ 7S: ⁷ 8S: ⁸ 9S: ⁹ +S: ⁺ -S: ⁻ =S: ⁼ (S: ⁽ )S: ⁾ nS: ⁿ 0s: ₀ 1s: ₁ 2s: ₂ 3s: ₃ 4s: ₄ 5s: ₅ 6s: ₆ 7s: ₇ 8s: ₈ 9s: ₉ +s: ₊ -s: ₋ =s: ₌ (s: ₍ )s: ₎ Currency symbols Li: ₤ Pt: ₧ W=: ₩ Eu: € =R: ₽ =P: ₽ Letterlike Symbols oC: ℃ co: ℅ oF: ℉ N0: № PO: ℗ Rx: ℞ SM: ℠ TM: ™ Om: Ω AO: Å Fractions 13: ⅓ 23: ⅔ 15: ⅕ 25: ⅖ 35: ⅗ 45: ⅘ 16: ⅙ 56: ⅚ 18: ⅛ 38: ⅜ 58: ⅝ 78: ⅞ Romans 1R: Ⅰ 2R: Ⅱ 3R: Ⅲ 4R: Ⅳ 5R: Ⅴ 6R: Ⅵ 7R: Ⅶ 8R: Ⅷ 9R: Ⅸ aR: Ⅹ bR: Ⅺ cR: Ⅻ 1r: ⅰ 2r: ⅱ 3r: ⅲ 4r: ⅳ 5r: ⅴ 6r: ⅵ 7r: ⅶ 8r: ⅷ 9r: ⅸ ar: ⅹ br: ⅺ cr: ⅻ Arrows and Math <-: ← -!: ↑ ->: → -v: ↓ <>: ↔ UD: ↕ <=: ⇐ =>: ⇒ ==: ⇔ FA: ∀ dP: ∂ TE: ∃ /0: ∅ DE: ∆ NB: ∇ (-: ∈ -): ∋ *P: ∏ +Z: ∑ -2: − -+: ∓ *-: ∗ Ob: ∘ Sb: ∙ RT: √ 0(: ∝ 00: ∞ -L: ∟ -V: ∠ PP: ∥ AN: ∧ OR: ∨ (U: ∩ )U: ∪ In: ∫ DI: ∬ Io: ∮ .:: ∴ :.: ∵ :R: ∶ ::: ∷ ?1: ∼ CG: ∾ ?-: ≃ ?=: ≅ ?2: ≈ =?: ≌ HI: ≓ !=: ≠ =3: ≡ =<: ≤ >=: ≥ <*: ≪ *>: ≫ !<: ≮ !>: ≯ (C: ⊂ )C: ⊃ (_: ⊆ )_: ⊇ 0.: ⊙ 02: ⊚ -T: ⊥ .P: ⋅ :3: ⋮ .3: ⋯ Eh: ⌂ <7: ⌈ >7: ⌉ 7<: ⌊ 7>: ⌋ NI: ⌐ (A: ⌒ TR: ⌕ Iu: ⌠ Il: ⌡ </: 〈 />: 〉 Control Pictures and OCR Vs: ␣ 1h: ⑀ 3h: ⑁ 2h: ⑂ 4h: ⑃ 1j: ⑆ 2j: ⑇ 3j: ⑈ 4j: ⑉ Enclosed Alphanumerics 1.: ⒈ 2.: ⒉ 3.: ⒊ 4.: ⒋ 5.: ⒌ 6.: ⒍ 7.: ⒎ 8.: ⒏ 9.: ⒐ Box Drawing Characters hh: ─ HH: ━ vv: │ VV: ┃ 3-: ┄ 3_: ┅ 3!: ┆ 3/: ┇ 4-: ┈ 4_: ┉ 4!: ┊ 4/: ┋ dr: ┌ dR: ┍ Dr: ┎ DR: ┏ dl: ┐ dL: ┑ Dl: ┒ LD: ┓ ur: └ uR: ┕ Ur: ┖ UR: ┗ ul: ┘ uL: ┙ Ul: ┚ UL: ┛ vr: ├ vR: ┝ Vr: ┠ VR: ┣ vl: ┤ vL: ┥ Vl: ┨ VL: ┫ dh: ┬ dH: ┯ Dh: ┰ DH: ┳ uh: ┴ uH: ┷ Uh: ┸ UH: ┻ vh: ┼ vH: ┿ Vh: ╂ VH: ╋ FD: ╱ BD: ╲ TB: ▀ LB: ▄ FB: █ lB: ▌ RB: ▐ .S: ░ :S: ▒ ?S: ▓ Geometric Shapes fS: ■ OS: □ RO: ▢ Rr: ▣ RF: ▤ RY: ▥ RH: ▦ RZ: ▧ RK: ▨ RX: ▩ sB: ▪ SR: ▬ Or: ▭ UT: ▲ uT: △ PR: ▶ Tr: ▷ Dt: ▼ dT: ▽ PL: ◀ Tl: ◁ Db: ◆ Dw: ◇ LZ: ◊ 0m: ○ 0o: ◎ 0M: ● 0L: ◐ 0R: ◑ Sn: ◘ Ic: ◙ Fd: ◢ Bd: ◣ Miscellaneous Symbols and Dingbats *2: ★ *1: ☆ <H: ☜ >H: ☞ 0u: ☺ 0U: ☻ SU: ☼ Fm: ♀ Ml: ♂ cS: ♠ cH: ♡ cD: ♢ cC: ♣ Md: ♩ M8: ♪ M2: ♫ Mb: ♭ Mx: ♮ MX: ♯ OK: ✓ XX: ✗ -X: ✠ CJK Symbols and Punctuation IS: ,_: 、 ._: 。 +": 〃 +_: 〄 *_: 々 ;_: 〆 0_: 〇 <+: 《 >+: 》 <': 「 >': 」 <": 『 >": 』 (": 【 )": 】 =T: 〒 =_: 〓 (': 〔 )': 〕 (I: 〖 )I: 〗 -?: 〜 Hiragana A5: ぁ a5: あ I5: ぃ i5: い U5: ぅ u5: う E5: ぇ e5: え O5: ぉ o5: お ka: か ga: が ki: き gi: ぎ ku: く gu: ぐ ke: け ge: げ ko: こ go: ご sa: さ za: ざ si: し zi: じ su: す zu: ず se: せ ze: ぜ so: そ zo: ぞ ta: た da: だ ti: ち di: ぢ tU: っ tu: つ du: づ te: て de: で to: と do: ど na: な ni: に nu: ぬ ne: ね no: の ha: は ba: ば pa: ぱ hi: ひ bi: び pi: ぴ hu: ふ bu: ぶ pu: ぷ he: へ be: べ pe: ぺ ho: ほ bo: ぼ po: ぽ ma: ま mi: み mu: む me: め mo: も yA: ゃ ya: や yU: ゅ yu: ゆ yO: ょ yo: よ ra: ら ri: り ru: る re: れ ro: ろ wA: ゎ wa: わ wi: ゐ we: ゑ wo: を n5: ん vu: ゔ "5: ゛ 05: ゜ *5: ゝ +5: ゞ Katakana a6: ァ A6: ア i6: ィ I6: イ u6: ゥ U6: ウ e6: ェ E6: エ o6: ォ O6: オ Ka: カ Ga: ガ Ki: キ Gi: ギ Ku: ク Gu: グ Ke: ケ Ge: ゲ Ko: コ Go: ゴ Sa: サ Za: ザ Si: シ Zi: ジ Su: ス Zu: ズ Se: セ Ze: ゼ So: ソ Zo: ゾ Ta: タ Da: ダ Ti: チ Di: ヂ TU: ッ Tu: ツ Du: ヅ Te: テ De: デ To: ト Do: ド Na: ナ Ni: ニ Nu: ヌ Ne: ネ No: ノ Ha: ハ Ba: バ Pa: パ Hi: ヒ Bi: ビ Pi: ピ Hu: フ Bu: ブ Pu: プ He: ヘ Be: ベ Pe: ペ Ho: ホ Bo: ボ Po: ポ Ma: マ Mi: ミ Mu: ム Me: メ Mo: モ YA: ャ Ya: ヤ YU: ュ Yu: ユ YO: ョ Yo: ヨ Ra: ラ Ri: リ Ru: ル Re: レ Ro: ロ WA: ヮ Wa: ワ Wi: ヰ We: ヱ Wo: ヲ N6: ン Vu: ヴ KA: ヵ KE: ヶ Va: ヷ Vi: ヸ Ve: ヹ Vo: ヺ .6: ・ -6: ー *6: ヽ +6: ヾ Bopomofo b4: ㄅ p4: ㄆ m4: ㄇ f4: ㄈ d4: ㄉ t4: ㄊ n4: ㄋ l4: ㄌ g4: ㄍ k4: ㄎ h4: ㄏ j4: ㄐ q4: ㄑ x4: ㄒ zh: ㄓ ch: ㄔ sh: ㄕ r4: ㄖ z4: ㄗ c4: ㄘ s4: ㄙ a4: ㄚ o4: ㄛ e4: ㄜ ai: ㄞ ei: ㄟ au: ㄠ ou: ㄡ an: ㄢ en: ㄣ aN: ㄤ eN: ㄥ er: ㄦ i4: ㄧ u4: ㄨ iu: ㄩ v4: ㄪ nG: ㄫ gn: ㄬ Enclosed CJK Letters and Months 1c: ㈠ 2c: ㈡ 3c: ㈢ 4c: ㈣ 5c: ㈤ 6c: ㈥ 7c: ㈦ 8c: ㈧ 9c: ㈨ Alphabetic Presentation Forms ff: ff fi: fi fl: fl ft: ſt st: st