Eu não falo nem leio hindi, mas corri uniname
nas palavras, o que, esperamos, dá o método para digitá-las:
$ uniname -bce <<< 'कर्ण'
UTF-32 glyph name
000915 क DEVANAGARI LETTER KA
000930 र DEVANAGARI LETTER RA
00094D ् DEVANAGARI SIGN VIRAMA
000923 ण DEVANAGARI LETTER NNA
$ uniname -bce <<< 'कृष्णा'
UTF-32 glyph name
000915 क DEVANAGARI LETTER KA
000943 ृ DEVANAGARI VOWEL SIGN VOCALIC R
000937 ष DEVANAGARI LETTER SSA
00094D ् DEVANAGARI SIGN VIRAMA
000923 ण DEVANAGARI LETTER NNA
00093E ा DEVANAGARI VOWEL SIGN AA