Syllable-initially indistinguishable from t.[2]: 23 [13]: 9 [10] When it must be distinguished from t medially, it can be written twice, and with both medial forms (as in ᠬᠤᠳᠳᠤᠭqudduγ 'well', compared with ᠬᠤᠲᠤᠭqutuγ 'holy').[13]: 59 [14] Alternatively, a dot is sometimes used to the right of the letter in 19th and 20th century manuscripts.[2]: 26
The belly-tooth-shaped form is used before consonants (syllable-final), the other before vowels.[13]: 58 [15]: 5
Derived from Old Uyghurtaw (𐾀; initial, belly-tooth-shaped medial, and final) and lamedh (𐽸; other medial form).[3]: 539–540, 545–546 [16]: 111, 113 [17]: 35
Positional variants on lamedh⟨ᠳ᠋/ᠲ/ᠳ᠋⟩ are used consistently for d in foreign words.[2]: 23 (As in ᠳ᠋ᠧᠩdēng / дэнden, ᠳᠡᠳ᠋ded / дэдded, or ᠡᠳ᠋ed / эдed).[14]
Produced with D using the Windows Mongolian keyboard layout.[18]
^As in the second person singular/plural pronoun ᠲᠠta 'you',[8]: 760 [2]: 85–86 or the intensifying ⟨ᠳᠠ⟩da/de (даа/дээdaa/dee) particle used after the predicate.[8]: 211
^Separated suffixes starting with the letter d include: ᠳᠠᠬᠢ⟨?⟩‑daki/‑deki (dative-locative or ordinal), ᠳᠠᠭ⟨?⟩/ ᠳᠡᠭ⟨?⟩‑daγ/‑deg (regular action), ᠳᠠᠭᠠᠨ⟨?⟩/ ᠳᠡᠭᠡᠨ⟨?⟩‑daγan/‑degen (reflexive+dative-locative), ᠳᠤᠭᠠᠷ⟨?⟩/ ᠳᠦᠭᠡᠷ⟨?⟩‑duγar/‑düger (ordinal), and ᠳᠤ⟨?⟩‑du/‑dü or ᠳᠤᠷ⟨?⟩‑dur/‑dür (dative-locative).[9]
^ ab"Mongolian transliterations"(PDF). Institute of the Estonian Language. 2006-05-06. Archived(PDF) from the original on 2021-11-22. Retrieved 2022-06-05.
^ abLessing, Ferdinand (1960). Mongolian-English Dictionary(PDF). University of California Press. Note that this dictionary uses the transliterations c, ø, x, y, z, ai, and ei; instead of č, ö, q, ü, ǰ, ayi, and eyi;: xii as well as problematically and incorrectly treats all rounded vowels (o/u/ö/ü) after the initial syllable as u or ü.[7]