Concept:
Bhatkhande and Paluskar Swaralipi are two important notation systems of Hindustani music.
Both systems use symbols to show swaras, laya, tala, matra, sam, khali, komal swara and tivra swara.
Step 1: Understand Bhatkhande Swaralipi.
Bhatkhande notation uses special marks to indicate komal and tivra swaras.
For komal swaras, a mark below the swara is commonly used.
Step 2: Understand Paluskar Swaralipi.
Paluskar notation also uses signs to show the nature of swaras.
Komal swara marking is used in a similar way.
Step 3: Identify the common symbol.
Among the given options, the symbol for:
\[
\text{Komal Swara}
\]
is used similarly in both systems.
Step 4: Final conclusion.
Therefore, the correct answer is:
\[
\boxed{\text{Komal Swara}}
\]
Hence:
\[
\boxed{\text{(C)}}
\]