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The ASCII Table

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ASCII stands for the American Standard Code for Information Interchage.
A character is a single 1-byte value that is translated as an ASCII code into either non-printing control codes (like backspace, tab, carriage return, line feed, etc.) or into something printable (which you can see as letters, numbers or symbols on your screen). Note that different fonts will represent characters differently; also, you need to be sure that you are using the standard character set (commonly known as Latin-1) in order to view these correctly. Different character sets use the same numbers for entirely different characters (such as math symbols, typographical symbols, even different language alphabets altogether!).
Below is a chart that lists each character's decimal value. For the control codes, it lists that code's short name and what it means; for the printable characters, it shows what the character looks like and what it is called.

 
Specialised ASCII Values used by mIRC
Decimal Value Control Code Meaning   Decimal Value Control Code Meaning
000 NUL $null   010 LF $lf
001 SOH CTCP Delimiter   013 CR $cr
002 STX Bold Text (ctrl-B)   015 SI Normal Text (ctrl-O)
003 ETX Colored Text (ctrl-K)   022 SYN Reversed Text (ctrl-R)
009 HT Tab   031 US Underlined Text (ctrl-U)


Standard ASCII (7-bit)   Extended ASCII (8-bit)
Decimal Value Control Code Meaning   Decimal Value Control Code Meaning
000 NUL Null   128 PAD Padding Character
001 SOH Start of Heading   129 HOP High Octet Present
002 STX Start of Text   130 BPH Break Permitted Here
003 ETX End of Text   131 NBH No Break Here
004 EOT End of Transmission   132 IND Index
005 ENQ Enquiry   133 NEL Next Line
006 ACK Acknowledge   134 SSA Start of Selected Area
007 BEL Bell   135 ESA End of Selected Area
008 BS Backspace   136 HTS Horizontal Tabulation Set
009 HT Horizontal Tab   137 HTJ Horizontal Tabulation with
Justification
010 LF Line Feed   138 VTS Vertical Tabulation Set
011 VT Vertical Tab   139 PLD Partial Line Forward
012 FF Form Feed   140 PLU Partial Line Backward
013 CR Carriage Return   141 RI Reverse Line Feed
014 SO Shift Out   142 SS2 Single-Shift 2
015 SI Shift In   143 SS3 Single-Shift 3
016 DLE Data Link Escape   144 DCS Device Control String
017 DC1 Device Control 1 (XON)   145 PU1 Private Use 1
018 DC2 Device Control 2   146 PU2 Private Use 2
019 DC3 Device Control 3 (XOFF)   147 STS Set Transmit State
020 DC4 Device Control 4   148 CCH Cancel Character
021 NAK Negative Acknowledge   149 MW Message Waiting
022 SYN Synchronous Idle   150 SPA Start of Protected Area
023 ETB End of Transmission Block   151 EPA End of Protected Area
024 CAN Cancel   152 SOS Start Of String
025 EM End of Medium   153 SGCI Single GraphicCharacter Introducer
026 SUB Substitute   154 SCI Single CharacterIntroducer
027 ESC Escape   155 CSI Control Sequence Introducer
028 FS File Separator   156 ST String Terminator
029 GS Group Separator   157 OSC Operating System Command
030 RS Record Separator   158 PM Privacy Message
031 US Unit Separator   159 APC Application Program Command
Printable Characters
032 SP Space   160 NBSP Non-Breaking Space
033 ! Exclamation Mark   161 ¡ Inverted Exclamation Mark
034 " Quotation Mark   162 ¢ Cent Sign
035 # Hash Mark
(Pound Sign)		   163 £ Pound Sterling Sign
036 $ Dollar Sign   164 ¤ General Currency Sign
037 % Percent Sign   165 ¥ Yen Sign
038 & Ampersand   166 ¦ Broken Vertical Bar
039 ' Apostrophe   167 § Section Sign
040 ( Left Parenthesis   168 ¨ Umlaut (Dieresis)
041 ) Right Parenthesis   169 © Copyright Sign
042 * Asterisk   170 ª Feminine Ordinal
043 + Plus Sign   171 « Left Angle Quote
044 , Comma   172 ¬ Vinculum (Not)
045 - Dash   173 ­ Soft-hyphen
046 . Period   174 ® Registered Sign
047 / Solidus (Slash)   175 ¯ Macron Accent (Overscore)
048 0 Digit Zero   176 ° Degree Sign
049 1 Digit One   177 ± Plus-minus Sign
050 2 Digit Two   178 ² Superscript 2
051 3 Digit Three   189 ³ Superscript 3
052 4 Digit Four   180 ´ Acute Accent Mark
053 5 Digit Five   181 µ Micro Sign
054 6 Digit Six   182 Paragraph or Pilcrow Sign
055 7 Digit Seven   183 · Middle Dot (Bullet)a
056 8 Digit Eight   184 ¸ Cedilla Mark
057 9 Digit Nine   185 ¹ Superscript 1
058 : Colon   186 º Masculine Ordinal
059 ; Semicolon   187 » Right Angle Quote
060 < Less-Than Sign   188 ¼ Fraction One-fourth
061 = Equal Sign   189 ½ Fraction One-half
062 > Greater-Than Sign   190 ¾ Fraction Three-quarters
063 ? Question Mark   191 ¿ Inverted Question Mark
064 @ Commercial At
(At Sign)		   192 À A - Grave Accent
065 A Uppercase A   193 Á A - Acute Accent
066 B Uppercase B   194 Â A - Circumflex Accent
067 C Uppercase C   195 Ã A - Tilde
068 D Uppercase D   196 Ä A - Umlaut (Dieresis)
069 E Uppercase E   197 Å A - Ring
070 F Uppercase F   198 Æ Æ Diphthong
071 G Uppercase G   199 Ç C - Cedilla
072 H Uppercase H   200 È E - Grave Accent
073 I Uppercase I   201 É E Acute Accent
074 J Uppercase J   202 Ê E - Circumflex Accent
075 K Uppercase K   203 Ë E - Umlaut (Dieresis)
076 L Uppercase L   204 Ì I - Grave Accent
077 M Uppercase M   205 Í I - Acute Accent
078 N Uppercase N   206 Î I - Circumflex Accent
079 O Uppercase O   207 Ï I - Umlaut (Dieresis)
080 P Uppercase P   208 Ð Eth (Icelandic)
081 Q Uppercase Q   209 Ñ N - Tilde
082 R Uppercase R   210 Ò O - Grave Accent
083 S Uppercase S   211 Ó O - Acute Accent
084 T Uppercase T   212 Ô O - Circumflex Accent
085 U Uppercase U   213 Õ O - Tilde
086 V Uppercase V   214 Ö O - Umlaut (Dieresis)
087 W Uppercase W   215 × Multiplication Sign
088 X Uppercase X   216 Ø O - Slash
089 Y Uppercase Y   217 Ù U - Grave Accent
090 Z Uppercase Z   218 Ú U - Acute Accent
091 [ Left Square
Bracket		   219 Û U - Circumflex Accent
092 \ Reverse Solidus
(Backslash)		   220 Ü U - Umlaut (Dieresis)
093 ] Right Square
Bracket		   221 Ý Y - Acute Accent
094 ^ Circumflex Accent
(Carat)		   222 Þ Capital THORN (Icelandic)
095 _ Underscore   223 ß Small Sharp s (German sz)
096 ` Grave Accent   224 à a - Grave Accent
097 a Lowercase a   225 á a - Acute Accent
098 b Lowercase b   226 â a - Circumflex Accent
099 c Lowercase c   227 ã a - Tilde
100 d Lowercase d   228 ä a - Umlaut (Dieresis)
101 e Lowercase e   229 å a - Ring
102 f Lowercase f   230 æ æ Diphthong
103 g Lowercase g   231 ç c - Cedilla
104 h Lowercase h   232 è e - Grave Accent
105 i Lowercase i   233 é e - Acute Accent
106 j Lowercase j   234 ê e - Circumflex Accent
107 k Lowercase k   235 ë e - Umlaut (Dieresis)
108 l Lowercase l   236 ì i - Grave Accent
109 m Lowercase m   237 í i - Acute Accent
110 n Lowercase n   238 î i - Circumflex Accent
111 o Lowercase o   239 ï i - Umlaut (Dieresis)
112 p Lowercase p   240 ð Small eth (Icelandic)
113 q Lowercase q   241 ñ n - Tilde
114 r Lowercase r   242 ò o - Grave Accent
115 s Lowercase s   243 ó o - Acute Accent
116 t Lowercase t   244 ô o - Circumflex Accent
117 u Lowercase u   245 õ o - Tilde
118 v Lowercase v   246 ö o - Umlaut (Dieresis)
119 w Lowercase w   247 ÷ Division Sign
120 x Lowercase x   248 ø Small o - Slash
121 y Lowercase y   249 ù u - Grave Accent
122 z Lowercase z   250 ú u - Acute Accent
123 { Left Brace
(Curly Bracket)		   251 û u - Circumflex Accent
124 | Vertical Line
(Pipe or Bar)		   252 ü u - Umlaut (Dieresis)
125 } Right Brace
(Curly Bracket)		   253 ý y - Acute Accent
126 ~ Tilde   254 þ Small thorn (Icelandic)
127 DEL Delete   255 ÿ y - Umlaut (Dieresis)

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