Template:Tlx

is used to explain different parameters for other templates. http://images.wikia.com/common/releases_200908.4/skins/common/images/button_bold.png

Usage

 * Up to 15 parameters for the specified template are displayed as placeholders, more parameters are shown as "|etc.".
 * If you want one of the prefixes such as subst: to be shown then add prefix=subst to the parameters.
 * If you wish to explain a named parameter then add the number of the parameter you are at and an = sign eg: 2 for the above 'first parameter'.