This table indicates what character will be inserted when you type the external hardware keyboard's key with "option" or "option+shift" modifier key. Made under iPhone 4, iOS 5.0.1, English keyboard layout, REUDO RBK-2300BTi and Unicoder Pro 1.1.2.

keywith optionwith option+shift
` ~(dead key for à/è/ì/ò/ù/À/È/Ì/Ò/Ù)`U+0060 GRAVE ACCENT
1 !¡U+00A1 INVERTED EXCLAMATION MARK⁄U+2044 FRACTION SLASH
2 @™U+2122 TRADE MARK SIGN€U+20AC EURO SIGN
3 #£U+00A3 POUND SIGN‹U+2039 SINGLE LEFT-POINTING ANGLE QUOTATION MARK
4 $¢U+00A2 CENT SIGN›U+203A SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
5 %∞U+221E INFINITYfiU+FB01 LATIN SMALL LIGATURE FI
6 ^§U+00A7 SECTION SIGNflU+FB02 LATIN SMALL LIGATURE FL
7 &U+00B6 PILCROW SIGN‡U+2021 DOUBLE DAGGER
8 *•U+2022 BULLET°U+00B0 DEGREE SIGN
9 (ªU+00AA FEMININE ORDINAL INDICATOR·U+00B7 MIDDLE DOT
0 )ºU+00BA MASCULINE ORDINAL INDICATOR‚U+201A SINGLE LOW-9 QUOTATION MARK
- _–U+2013 EN DASH—U+2014 EM DASH
= +≠U+2260 NOT EQUAL TO±U+00B1 PLUS-MINUS SIGN
q QœU+0153 LATIN SMALL LIGATURE OEŒU+0152 LATIN CAPITAL LIGARURE OE
w W∑U+2211 N-ARY SUMMATION„U+201E DOUBLE LOW-9 QUOTATION MARK
e E(dead key for á/é/í/ó/ú/Á/É/Í/Ó/Ú)´U+00B4 ACUTE ACCENT
r R®U+00AE REGISTERED SIGN‰U+2030 PER MILLE SIGN
t T†U+2020 DAGGERˇU+02C7 CARON
y Y¥U+00A5 YEN SIGNÁU+00C1 LATIN CAPITAL LETTER A WITH ACUTE
u U(dead key for ä/ë/ï/ö/ü/ÿ/Ä/Ë/Ï/Ö/Ü/Ÿ)¨U+00A8 DIAERESIS
i I(dead key for â/ê/î/ô/û/Â/Ê/Î/Ô/Û)ˆU+02C6 MODIFIER LETTER CIRCUMFLEX ACCENT
o OøU+00F8 LATIN SMALL LETTER O WITH STROKEØU+00D8 LATIN CAPITAL LETTER O WITH STROKE
p PπU+03C0 GREEK SMALL LETTER PI∏U+220F N-ARY PRODUCT
[ {“U+201C LEFT DOUBLE QUOTATION MARK”U+201D RIGHT DOUBLE QUOTATION MARK
] }‘U+2018 LEFT SINGLE QUOTATION MARK’U+2019 RIGHT SINGLE QUOTATION MARK
\ |«U+00AB LEFT-POINTING DOUBLE ANGLE QUOTATION MARK(no character assigned)
a AåU+00E5 LATIN SMALL LETTER A WITH RING ABOVEÅU+00C5 LATIN CAPITAL LETTER A WITH RING ABOVE
s SßU+00DF LATIN SMALL LETTER SHARP SÍU+00CD LATIN CAPITAL LETTER I WITH ACUTE
d D∂U+2202 PARTIAL DIFFERENTIALÎU+00CE LATIN CAPITAL LETTER I WITH CIRCUMFLEX
f FƒU+0192 LATIN SMALL LETTER F WITH HOOKÏU+00CF LATIN CAPITAL LETTER I WITH DIAERESIS
g G©U+00A9 COPYRIGHT SIGN˝U+02DD DOUBLE ACUTE ACCENT
h H˙U+02D9 DOT ABOVEÓU+00D3 LATIN CAPITAL LETTER O WITH ACUTE
j J∆U+2206 INCREMENTÔU+00D4 LATIN CAPITAL LETTER O WITH CIRCUMFLEX
k K˚U+02DA RING ABOVEU+F8FF (Private Use Area: Apple Mark in iOS)
l L¬U+00AC NOT SIGNÒU+00D2 LATIN CAPITAL LETTER O WITH GRAVE
; :…U+2026 HORIZONTAL ELLIPSISÚU+00DA LATIN CAPITAL LETTER U WITH ACUTE
' "æU+00E6 LATIN SMALL LETTER AEÆU+00C6 LATIN CAPITAL LETTER AE
z ZΩU+03A9 GREEK CAPITAL LETTER OMEGA(no character assigned)
x X≈U+2248 ALMOST EQUAL TO(no character assigned)
c CçU+00E7 LATIN SMALL LETTER C WITH CEDILLA(no character assigned)
v V√U+221A SQUARE ROOT(no character assigned)
b B∫U+222B INTEGRAL(no character assigned)
n N(dead key for ã/ñ/õ/Ã/Ñ/Õ)˜U+02DC SMALL TILDE
m MµU+00B5 MICRO SIGNÂU+00C2 LATIN CAPITAL LETTER A WITH CIRCUMFLEX
, <≤U+2264 LESS-THAN OR EQUAL TO¯U+00AF MACRON
. >≥U+2265 GREATER-THAN OR EQUAL TO˘U+02D8 BREVE
/ ?÷U+00F7 DIVISION SIGN(no character assigned)

Visual map. Right column is with option, and upper column is with shift. Red ones are dead keys.

~ `
` `		 ! ⁄
1 ¡		 @ €
2 ™		 # ‹
3 £		 $ ›
4 ¢		 % fi
5 ∞		 ^ fl
6 §		 & ‡
7 ¶		 * °
8 •		 ( ·
9 ª		 ) ‚
0 º		 _ —
- –		 + ±
= ≠
Q Œ
q œ		 W „
w ∑		 E ´
e ´		 R ‰
r ®		 T ˇ
t †		 Y Á
y ¥		 U ¨
u ¨		 I ˆ
i ˆ		 O Ø
o ø		 P ∏
p π		 { ”
[ “		 } ’
] ‘		 |
\ «
A Å
a å		 S Í
s ß		 D Î
d ∂		 F Ï
f ƒ		 G ˝
g ©		 H Ó
h ˙		 J Ô
j ∆		 K 
k ˚		 L Ò
l ¬		 : Ú
; …		 " Æ
' æ
Z
z Ω		 X
x ≈		 C
c ç		 V
v √		 B
b ∫		 N ˜
n ˜		 M Â
m µ		 < ¯
, ≤		 > ˘
. ≥		 ?
/ ÷