For more information, please see Wiki Page Editor and Wiki Syntax

Wiki Syntax
Bold text     __tekst__
Italic text     2 single quotes (').     '"tekst"'
Underlined text     ===tekst===
Farvet tekst ~~#FFEE33:tekst~~ eller ~~yellow:tekst~~. Will display using the indicated HTML color or color name. Color name can contain two colors separated by a comma. In this case, the first color would be the foreground and the second one the background.
Deleted text     2 dashes "-".     --tekst--
Headings !heading1, !!heading2, !!!heading3
Show/Hide !+, !!- show/hide heading section. + (shown) or - (hidden) by default.
Autonumbered Headings !#, !!#, !+#, !-# ...
Table of contents {toc}, {maketoc} prints out a table of contents for the current page based on structures (toc) or ! headings (maketoc). Common optional parameters for maketoc are: title|maxdepth|levels|nums, and for toc are: order|showdesc|shownum|structId|maxdepth|pagename.
Horizontal rule     ----
Text box     ^Boks indhold^
Centered text     ::tekst::
Dynamic variables %Navn% Inserts an editable variable
Eksterne links use square brackets for an external link: [URL], [URL|link_description],[URL|link_description|relation] or [URL|description|relation|nocache] (that last prevents the local Wiki from caching the linked page; relation can be used to insert rel attribute for the link - useful e.g. for shadowbox). For an external Wiki, use ExternalWikiName:PageName or ((External Wiki Name: Page Name))
Square Brackets Use [[foo] to show [foo].
Wiki Referencer ((side)) eller ((side|beskrivelse)) til wiki referencer
Lister * giver lister med punkttegn, # giver numererede lister, ;Ord:definition giver definitionsoversigt
Indentation +, ++ Creates an indentation for each plus (useful in list to continue at the same level)
Tabeller || row1-kol1 | row1-kol2 | row1-kol3 row2-kol1 | row2-kol2 | row2-kol3 ||
Titelbjælke     -=Titel=-
Monospace font     -+Code sample+-
Line break %%% (very useful especially in tables)
Fler-sidet Sider Brug ...page... to separate pages
Ikke-gennemsete sektioner ~np~ data ~/np~ Prevents wiki parsing of the enclosed data.
Preformated sections ~pp~ data ~/pp~ Displays preformated text/code; no Wiki processing is done inside these sections (as with np), and the spacing is fixed (no word wrapping is done). ~pre~ data ~/pre~ also displayes preformatted text with fixed spacing, but wiki processing still occurs on the text.
Kommentarer ~tc~ Tiki Comment ~/tc~ makes a Tiki comment. It will be completely removed from the display, but saved in the file for future reference. ~hc~ HTML Comment ~/hc~ makes an HTML comment. It will be inserted as a comment in the output HTML; these are not normally displayed in browsers, but can be seen using "View Source" or similar.
Direction {r2l}, {l2r}, {rm}, {lm}Insert resp. right-to-left and left-to-right text direction DIV (up to end of text) and markers for langages as arabic or hebrew.
Special characters ~hs~ hard space, ~c~ ©, ~amp~ &, ~lt~ <, ~gt~ >, ~ldq~ “, ~rdq~ ”, ~lsq~ ‘, ~rsq~ ’, ~--~ —, ~bs~ \, numeric between ~ for html numeric characters entity

Because the Wiki paragraph formatting feature is off, each line will be presented as you write it. This means that if you want paragraphs to be wrapped properly, a paragraph should be all together on one line.

Note that plugin arguments can be enclosed with double quotes ("); this allows them to contain , or = or >.
More help here

Beskrivelse
Forfatter Color codes parts of the page like 'Track changes' in Office programs.
Bliptv Display a Blip.tv video
Box Indsætter en tema styret boks på en wiki side
Centrer Centrerer plugin indholdet på wiki siden
Kode Displays a snippet of code
Div Insert a division block, span, blockquote or other text formatting on wiki page.
Definition List Creates a definition list
Fade Displays a label. On click, the block of content will fade in and fade out.
Fancy List Creates a fancy-looking list
Fancy Table Viser data vha. Tikiwiki lige/ulige tabel stil
Fil Displays a link to a file (either from the file gallery or an attachment to a wiki page) and can display an image attachment. For more than one file from file galleries, or more optional information shown from the files, use the plugin FILES instead
Flash video Displays a Flash (.swf) file in the wiki page
googlemap Displays a Google map
Gruppe Display wiki text if user is in one of listed groups
Group List List all groups or just groups that include a certain group
Group Stats Displays the percentage of total users that are members of groups
HTML Include literal HTML in a Wiki page
Billede Display images
Medtag Include a page's content.
Invite Invite an email in groups.
Kaltura video Displays a KALTURA video on the wiki page
Mail Directly mail other users or groups
Mediaplayer Simple mp3 or flv Player
Insert Module Displays a module inline in a wiki page. More parameters can be added, not supported by User Interface.
Mouseover Create a mouseover feature on some text
Quote Quote text by surrounding the text with a box, like the [QUOTE] BBCode
Remarks Box Displays a comment, tip, note or warning box
RSS Feed Inserts an RSS feed output.
Sorter Sorterer plugin indholdet på wiki siden
Split Split a page into rows and columns
Subscript Displays text in subscript.
Superscript Displays text in superscript (exponent).
Tabs Display page content in a set of tabs
Tracker Comments Displays the number of tracker comments
Transclusion Includes the content of a wiki page and replaces values in the body of the included page. All additional parameters will be replaced. For example %%%title%%% will be replaced with the parameter title in the plugin.
Userlink function Makes a link to the user information page
Vimeo Display a Vimeo video
Youtube Display youtube video