The part of speech; the name of the category without the final s, for example {{tt-pos|noun|...}} for Category:Tatar nouns
None, mandatory
2
The script; either Latin (Latn, l or r); Cyrillic (Cyrl or c) or Arabic (Arab or a)
None, mandatory
3 and 4
To display another script, both 3 and 4 are required. 3 is the script name/template as above (Latn, l, r, Cyrl, c, Arab, a) and 4 is the word in that script
None, optional
5 and 6
To display a third script, both 5 and 6 are required. 5 is the script name/template as above (Latn, l, r, Cyrl, c, Arab, a) and 6 is the word in that script
While Tatar has rarely used the Arabic script since 1928, historical forms of words are allowable, hence the inclusion of Arabic in this template. For more information, see Tatar language on Wikipedia.Wikipedia