{{Cs icon}} is a template usually used to indicate to readers that an external link is in a foreign language (Czech); no parameters are needed.

It should generally be placed after the external link, although this is not set in stone. For more information, see the Manual of Style.

The template uses the {{link language}} format, but is shortened by simply having the name {{xx icon}}, where xx represents the language code. These can be found in the "Alpha-2" column of the list of ISO 639 codes. Please be aware that language codes do not always coincide with country codes (see the list of ISO 3166-1 codes).

For citations, the language parameter of the various citation templates ({{cite web}}, {{cite news}}, {{cite journal}}, etc) should be used instead.

ವರ್ಗ:Language icon templates contains a full list of the templates that can be used.