{{tl2}} is similar to {{tl}}. Tl stands for Template link. {{tl2}} is a macrotemplate used to display a template name as a link surrounded by braces, thus showing how the template name would be used in code. Its primary use is in instruction and documentation.
{{tl2}} differs from {{tl}} in that it displays with a wider, monospaced text style, like {{tlx}}, and also takes the named parameters 'SISTER=xx' and 'LANG=ll', so that it may also be used to list and link to templates on other English and non-English language sister projects.
Related template
{{tlx}} displays with the same enhanced presentation, and in addition expands several 'placeholder' parameters to generate a sample template call.
Usage
{{Tl|template name to display}}and {{Tl2|template name to display}} -- local link, just like Tl. or {{Tl2|SISTER=V:|template name to display}} -- displays a template on Wikiversity or {{Tl2|LANG=fr.|SISTER=wikisource|template name to display}} -- displays a template on the French Wikisource sister project.