I know that ஷ is used more often than ஶ, and ஶ is mainly only used to write ஶ்ரீ (sri). But I can’t tell the difference between the sounds of both letters, or whether there is a difference. Are they like the Hindi letters श and ष? If yes, which is which?
The Russian alphabet has the same confusion between the letters Ш and Щ, often transcribed as “sh” and “shch” respectively, but the actual pronunciation of both sounds like “sh” in English words.