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Astronomical symbols – Symbols in astronomy; Chemical symbol – Abbreviations used in chemistry; Chinese punctuation – Punctuation used with Chinese characters; Currency symbol – Symbol used to represent a monetary currency's name; Diacritic – Modifier mark added to a letter (accent marks etc.)
Non-printing characters or formatting marks are characters for content designing in word processors, which are not displayed at printing. It is also possible to customize their display on the monitor. The most common non-printable characters in word processors are pilcrow, space, non-breaking space, tab character etc. [1] [2]
Filler text (also placeholder text or dummy text) is text that shares some characteristics of a real written text, but is random or otherwise generated. It may be used to display a sample of fonts , generate text for testing, or to spoof an e-mail spam filter .
The replacement character (often displayed as a black rhombus with a white question mark) is a symbol found in the Unicode standard at code point U+FFFD in the Specials table. It is used to indicate problems when a system is unable to render a stream of data to correct symbols.
When adding an image to an infobox, thumbnails should NOT be used. Infobox templates should implement the InfoboxImage module to help with formatting of images so simply supplying the file name will work. For example, to use File:Image PlaceHolder.png, you can simply use |image=Image PlaceHolder.png.
If an image is desired but not available, one may add "yes" to the "needs-photo" section of the :Template:WPBiography on the talkpage. If no image is available yet, do not use an image placeholder. Example abc.jpg, xpz.png, 123.gif: File: suggested: Image upright: image_upright: Scales the image thumbnail from its default size by the given factor.
Because of the risk that placeholder material might accidentally be published, it is clearly marked with an FPO indicator in the form of a simulated watermark or overprint, stamp, or the like in the expectation that it will make the placeholder's presence obvious to designers working on the layout; reviewing proof copies; or, as a last resort ...
See Wikipedia:Image placeholders for more information. This category consists of image placeholders for requested images . When using an image in this category it is recommended to apply the class attribute values "metadata" (to suppress printing) and "dummy" (to allow users to suppress display).