Like Template:Tlx (edit talk links history) and {{Tlsp}} for up to three parameters, used in template lists adding links in the same style as {{Lts/}} and {{Tlrow}}. See above for an example what it does. {{Tetl}} now covers the formerly separate Tetlp, Tnetlp, and Tnetl.
See: Tetl template documentation zh:Template:Tetl