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Why not simply hit Alt+248 - 360°
Because that's never worked for me, perhaps?
I use the BBCodeXtra plug in on FireFox (seemingly unsupported, but it still works), and my "Maths" character collection uses the following entries (format : entity ; entity decomposed with spaces ; description including UNICODE codepoint) :
Code:
<BR>× & times ; U+00D7 Multiplication symbol.
<BR>÷ & divide ; U+00F7 Divide symbol.
<BR>≤ & le ; U+2264 Less-than-equal symbol.
<BR>≥ & ge ; U+2265 Greater-than-equal symbol.
<BR>° & deg ; U+00B0 ; degree symbol
<BR>± & plusmn ; U+00B1 (177) ; plus-minus sign (plus-or-minus sign)
<BR>² & sup2 ; U+00B2 (178) superscript two (superscript digit two, squared)
<BR>³ & sup3 ; U+00B3 (179) superscript three (superscript digit three, cubed)
<BR>− & minus ; U+2212 (8722) ; minus operator
<BR>∗ & lowast ; U+2217 (8727) ; asterisk operator
<BR>√ & radic ; U+221A (8730) ; square root (radical sign)
<BR>∝ & prop ; U+221D (8733) ; proportional to
<BR>∞ & infin ; U+221E (8734) ; infinity
<BR>∠ & ang ; U+2220 (8736) ; angle
<BR>∧ & and ; U+2227 (8743) ; logical and (wedge)
<BR>∨ & or ; U+2228 (8744) ; logical or (vee)
<BR>∩ & cap ; U+2229 (8745) ; intersection (cap)
<BR>∪ & cup ; U+222A (8746) ; union (cup)
<BR>∫ & int ; U+222B (8747) ; integral
<BR>∴ & there4 ; U+2234 (8756) ; therefore sign
<BR>∼ & sim ; U+223C (8764) ; tilde operator (varies with, similar to)
<BR>≅ & cong ; U+2245 (8773) ; congruent to
<BR>≈ & asymp ; U+2248 (8776) ; almost equal to (asymptotic to)
<BR>≠ & ne ; U+2260 (8800) ; not equal to
<BR>≡ & equiv ; U+2261 (8801) ; identical to; sometimes used for 'equivalent to'
<BR>⊂ & sub ; U+2282 (8834) ; subset of
<BR>⊃ & sup ; U+2283 (8835) ; superset of
<BR>⊄ & nsub ; U+2284 (8836) ; not a subset of
<BR>⊆ & sube; U+2286 (8838) ; subset of or equal to
<BR>⊇ & supe ; U+2287 (8839) ; superset of or equal to
<BR>⊕ & oplus ; U+2295 (8853) ; circled plus (direct sum) EARTH
<BR>⊗ & otimes ; U+2297 (8855) ; circled times (vector product)
<BR>⊥ & perp ; U+22A5 (8869) ; up tack (orthogonal to, perpendicular)
<BR>⋅ & sdot ; U+22C5 (8901) ; dot operator
<BR>⌈ & lceil ; U+2308 (8968) ; left ceiling (APL upstile)
<BR>⌉ & rceil ; U+2309 (8969) ; right ceiling
<BR>⌊ & lfloor ; U+230A (8970) ; left floor (APL downstile)
<BR>⌋ & rfloor ; U+230B (8971) ; right floor
<BR>⟨ & lang ; U+2329 (9001) ; left-pointing angle bracket (bra)
<BR>⟩ & rang ; U+232A (9002) ; right-pointing angle bracket (ket)
I just paste the whole lot in (well, BBCodeXtra does), then delete what I don't want. It's clunky, but it works for me.
<P>I'd better Preview. Burned fingertips!
Well, bowdlerise me - even the entities were de-fanged.