Sanskrit letters in Tamil
The following five letters, introduced from Sanskrit are used in Tamil.
ஷ - sha. This letter has the sound of sh as in shut. Sometimes instead of using the Sanskrit letter, the equivalent Tamil letter used is ட. Eg., நஷ்டம்(nashtam) - நட்டம்(nattam) means loss.
ஸ - sa - Has the sound of s in sun. for example, புஸ்தகம்(pustakam)- book is sometimes written in pure Tamil as புத்தகம்(puththagam).
ஜ - ja. It has the sound of j in jug. The Tamil letter used in its place ச(sa/cha). ஜனம்(janam-people) is written as சனம்(sanam)
க்ஷ-ksha. It is combination of ka and sha. The Tamil letters used in its place are ட்ச. மோக்ஷம்(moksham-heaven) is written as மோட்சம்(motcham)
ஹ-ha. h as in hut. Mostly, in names having ha it is replaced by ka/ga. மனோஹர்(Manohar) is written as மனோகர்(Manogar).
ஸ்ரீ - sri. sri as in sridevi. Mostly for writing names and places with sri in it. ஸ்ரீதேவி (sridevi - a name), ஸ்ரீரங்கம்(srirangam - a place)