From English Wikipedia @ Freddythechick
Subscripts text two times, i.e.
{{subsub|Text to be subscripted twice}} produces: Text to be subscripted twice
This is equivalent to writing <sub><sub>Text to be subscripted twice</sub></sub>.
See also
Superscript and subscript-related templates |
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| {{sup}} and related templates | Combined super/subscripts |
| sup | | textsuperscript superscripttext | | smallsup | (ssup) | textsmall superscript small superscripttext | | i sup | (isup · padlsup) | textsuperscript (rather than: textsuperscript) | | i smallsup | (issup · padlssup) | textsmall superscript (rather than: textsmall superscript) | | b sup | (bsup) | textsuperscript (rather than: textsuperscript) | | sub | | textsubscript subscripttext | | smallsub | (ssub) | textsmall subscript small subscripttext | | subsub | | textdouble-subscripted double-subscriptedtext |
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