[greyed out icons of the page types]
apps-pagetree-page-default-not-in-menu
apps-pagetree-page-shortcut-external-not-in-menu
apps-pagetree-page-shortcut-not-in-menu
apps-pagetree-page-backend-user-not-in-menu
apps-pagetree-page-mountpoint-not-in-menu
apps-pagetree-spacer-not-in-menu
apps-pagetree-folder-default-not-in-menu

apps-pagetree-dust-bin              [dust bin; probably the same icon as actions-edit-delete]
apps-pagetree-dust-bin-not-in-menu  

== Mimetypes-x ==
mimetypes-x-content-template-extension [extension template; probably the same icon as actions-template-new]
mimetypes-x-content-splash             [tt_content splash?]
mimetypes-x-content-uploads            [tt_content uploads?]
mimetypes-x-content-search             [tt_content search?]

== Timings ==
status-overlay-scheduled-start      [page is hidden but will be shown in the future; possible red clock with green outer lines]
status-overlay-scheduled-end        [page is hidden but was shown in the past; possible red clock]
status-overlay-scheduled-future-end [page is shown but will he hidden in the future; possible green clock with red outer lines]

== Various ==
actions-selection-delete            [a [x] button; remove something from a selection box ]
actions-system-options-view         [open the additional options]

== Mimetypes ==
'htm'   => 'mimetype-text-htm',
'html'  => 'mimetype-text-htm',
'css'   => 'mimetype-text-css',
'js'    => 'mimetype-text-js',
'csv'   => 'mimetype-text-csv',
'xml'   => 'mimetype-text-xml',
'php'   => 'mimetype-text-php',
'php6'  => 'mimetype-text-php',
'php5'  => 'mimetype-text-php',
'php4'  => 'mimetype-text-php',
'php3'  => 'mimetype-text-php',
'inc'   => 'mimetype-text-php',
'ts'    => 'mimetype-text-ts',
'txt'   => 'mimetype-text-text',
'class' => 'mimetype-text-text',
'tmpl'  => 'mimetype-text-text',
'jpg'   => 'mimetype-media-image-jpg',
'jpeg'  => 'mimetype-media-image-jpg',
'gif'   => 'mimetype-media-image-gif',
'png'   => 'mimetype-media-image-png',
'bmp'   => 'mimetype-media-image-bmp',
'tif'   => 'mimetype-media-image',
'tga'   => 'mimetype-media-image',
'psd'   => 'mimetype-media-image',
'eps'   => 'mimetype-media-image',
'avi'   => 'mimetype-media-video-avi',
'mpg'   => 'mimetype-media-video',
'mpeg'  => 'mimetype-media-video',
'mov'   => 'mimetype-media-video',
'wav'   => 'mimetype-media-audio',
'mp3'   => 'mimetype-media-audio',
'mid'   => 'mimetype-media-audio',
'swf'   => 'mimetype-media-flash',
'swa'   => 'mimetype-media-flash',
'exe'   => 'mimetype-executable-executable',
'com'   => 'mimetype-executable-executable',
't3x'   => 'mimetype-compressed-t3x',
't3d'   => 'mimetype-compressed-t3d',
'zip'   => 'mimetype-compressed-compressed',
'tgz'   => 'mimetype-compressed-compressed',
'gz'    => 'mimetype-compressed-compressed',
'pdf'   => 'mimetype-word-pdf',
'doc'   => 'mimetype-word-word',
'sxw'   => 'mimetype-word-word',
'rtf'   => 'mimetype-word-word',
'xls'   => 'mimetype-spreadsheet-spreadsheet',
'sxc'   => 'mimetype-spreadsheet-spreadsheet',
'ttf'   => 'mimetype-font-font',
'ppt'   => 'mimetype-presentation-presentation',
'default' => 'mimetype-other-other'