Throughout, h = H.
alu (archaic) = ~l
aloo (archaic) = ~L
arasunna = @M
visarga = @h
avagraha (used in Sanskrit) = @2
na pollu (arachaic) = @n
null operation = _ (underscore) (view rts/doc/rtsdefn.dvi)

Syllable break = ^ (view rts/doc/rtsdefn.dvi)
Force combination = & (view rts/doc/rtsdefn.dvi)
For "sunnaa", (view rts/doc/rtsdefn.dvi)

tcha (allophone of c, now extinct) = ~c
tja (allophone of j, now extnict) = ~j