In Emacs, insert these with C-x 8 RET (which calls ucs-insert) then type the code point. To get info on the character under the cursor, use M-x describe-char.

On a GTK+-based desktop, use Shift-Ctrl-u to insert a Unicode character. On Mac OS X, set input menu to “unicode hex input”, hold down the option key, and type the hex digits.

Character data in the table below was gathered from http://www.utf8-chartable.de/unicode-utf8-table.pl.

Note: superscripts and subscripts are around U+2070 and above (though superscript 1, 2, & 3 are near U+00b9).

To find a unicode character where you have an idea of what it looks like, try http://shapecatcher.com/.

Unicode Code Point Character Full Name
00a0   NO-BREAK SPACE
00a2 ¢ CENT SIGN
00a9 © COPYRIGHT SIGN
00ab « LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
00bb » RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
00b0 ° DEGREE SIGN
00b1 ± PLUS-MINUS SIGN
00b7 · MIDDLE DOT
00d7 × MULTIPLICATION SIGN
2011 NON-BREAKING HYPHEN
2013 EN DASH
2014 EM DASH
2018 LEFT SINGLE QUOTATION MARK
2019 RIGHT SINGLE QUOTATION MARK
201c LEFT DOUBLE QUOTATION MARK
201d RIGHT DOUBLE QUOTATION MARK
2022 BULLET
2026 HORIZONTAL ELLIPSIS
2032 PRIME
2033 DOUBLE PRIME
20ac EURO SIGN
2122 TRADE MARK SIGN
2190 LEFTWARDS ARROW
2191 UPWARDS ARROW
2192 RIGHTWARDS ARROW
2193 DOWNWARDS ARROW
2194 LEFT RIGHT ARROW
21c4 RIGHTWARDS ARROW OVER LEFTWARDS ARROW
21d2 RIGHTWARDS DOUBLE ARROW
223c TILDE OPERATOR
2245 APPROXIMATELY EQUAL TO
2248 ALMOST EQUAL TO
2260 NOT EQUAL TO
2264 LESS-THAN OR EQUAL TO
2265 GREATER-THAN OR EQUAL TO
226a MUCH LESS-THAN
226b MUCH GREATER-THAN
2301 ELECTRIC ARROW
2318 PLACE OF INTEREST SIGN
25cb WHITE CIRCLE
25d4 CIRCLE WITH UPPER RIGHT QUADRANT BLACK
25d1 CIRCLE WITH RIGHT HALF BLACK
25d5 CIRCLE WITH ALL BUT UPPER LEFT QUADRANT BLACK
25cf BLACK CIRCLE
2610 BALLOT BOX
2611 BALLOT BOX WITH CHECK
2612 BALLOT BOX WITH X
2615 HOT BEVERAGE
262e PEACE SYMBOL
262f YIN YANG
263a WHITE SMILING FACE
2661 WHITE HEART SUIT
2693 ANCHOR
2713 CHECK MARK
2730 SHADOWED WHITE STAR
fffd REPLACEMENT CHARACTER