The viola is tuned one fifth below the violin and therefore they have three strings tuned in common: G, D, and which other?
A Ａ A (letter) 🄰 🄐 U+0043 🅐 LetterA ⒜ The Letter A
lettera ⒜ ａ 🄐 🄰 🅐 u 0043 letter
WikipediaEntity
A