This is the page identified by the palindromic URL  http://ed.xozzox.de//:ptth

A palindrome is a text (generally: any sequence of letters and numbers)
which can be read backwards, yielding the same words as when reading normally.

White space characters, capitalization and punctuation marks are usually ignored in this definition.
For palindromic URLs, however, every character has to be considered.

Palindromes exhibit a "syntactical mirror symmetry" with respect to an imaginary axis through
the center of the character string (and "perpendicular" to it).
This is not an optical mirror symmetry, since the character shapes are maintained: they do not
become their geometric mirror images, only their sequence is reversed.

See my ambigram URL for a true geometrical rotation symmetry of a character sequence denoting a URL.
(use the back button of your browser or go directly to www.xozzox.de/complexity/specialurls.html
when you landed on this page via a domain other than xozzox.de, i.e. via a search engine hit)

For more information on palindromes, check out the Wikpedia article http://en.wikipedia.org/wiki/Palindrome


Two examples:

One of the most famous ones is:

	A man, a plan, a canal - Panama

The "center of symmetry" is the letter "c", which only occurs once. (And "a" is the only vowel.)
For some thoughts about the source of this palindrome see http://www.fun-with-words.com/palin_first_panama.html


A recent (as far as I know first published in Februrary 2009) creation 
by the US comedian Demtri Martin (www.demetrimartin.com) has 224 words.
Here the center is the "I" in line 14, "Be still if I fill its ebb".


	"Dammit I’m Mad"

    Dammit I’m mad.
    Evil is a deed as I live.
    God, am I reviled? I rise, my bed on a sun, I melt.
    To be not one man emanating is sad. I piss.
    Alas, it is so late. Who stops to help?
    Man, it is hot. I’m in it. I tell.
    I am not a devil. I level “Mad Dog”.
    Ah, say burning is, as a deified gulp,
    In my halo of a mired rum tin.
    I erase many men. Oh, to be man, a sin.
    Is evil in a clam? In a trap?
    No. It is open. On it I was stuck.
    Rats peed on hope. Elsewhere dips a web.
    Be still if I fill its ebb.
    Ew, a spider… eh?
    We sleep. Oh no!
    Deep, stark cuts saw it in one position.
    Part animal, can I live? Sin is a name.
    Both, one… my names are in it.
    Murder? I’m a fool.
    A hymn I plug, deified as a sign in ruby ash,
    A Goddam level I lived at.
    On mail let it in. I’m it.
    Oh, sit in ample hot spots. Oh wet!
    A loss it is alas (sip). I’d assign it a name.
    Name not one bottle minus an ode by me:
    “Sir, I deliver. I’m a dog”
    Evil is a deed as I live.
    Dammit I’m mad.

A piece in which the "palindromicity" is on a sentence level is at
	http://www.tammycamp.com/2011/03/16/renegade-a-modern-palindrome.html
Interesting, because it allows the meaning of the reverse part to be different.

other palindromic URLs:
http://www.rdg.ac.uk/~sssbownj/jnwobsss~/ku.ca.gdr.www//:ptth/  (defunct)
http://www.gef.free.fr/rf.eerf.feg.www//:ptth
http://graner.net/nicolas/salocin/ten.renarg//:ptth
http://wordsmith.org/words/sdrow/gro.htimsdrow//:ptth

The last one is by Nicolas Graner, who also has created a ambigrammatic URL.

(Note: this is a pure text page, so no html links ... you have to copy URLs on this page and paste them into the address page of your browser.)