Etymology

From Proto-Sino-Tibetan *g-sum ‎(“three”).

Pronunciation

• Old Tibetan:
  • IPA^(key): /*ksum/ (reconstructed)
• Ü-Tsang
  • Tibetan Pinyin: sum^f
  • (Lhasa) IPA^(key): /sum˥˥/
• Khams
  • (Batang) IPA^(key): /sɑ̃˥˥/
  • (Dêgê) IPA^(key): /suŋ˥˥/
• Amdo
  • (Zêkog) IPA^(key): /ɣsəm/
  • (Bla-Brang) IPA^(key): /hsəm/