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Carnatic music notation is written using the solfa 'sa ri ga ma pa da ni' in textual form unlike the staff notation which is graphic. In carnatic music sa (shadjam) is the tonic. The artiste has the liberty to choose any pitch as the tonic and the note sa will then refer to that pitch. Hence the notation does not prescribe the absolute pitches in which the composition is to be sung.
Generally the notation is used to learn a composition rather than play it by sight and some of the practices in writing notation may be attributed to this.
Samples of notation in Tamil and English are given below.
The notation is written on one line and the lyric is written on the line below with words of lyric aligned to their corresponding notes.
To establish the rhythmic frame work ('Thaalam'), vertical lines are drawn, to separate the 'angams' (components) of a rhythmic cycle. The commonly used thaalams have three 'angams' - Laghu, Dhrutham and Anudhrutham. The Dhrutham is always 2 units of time and in singing the action (kriya) associated with it is a clap (or beat) and a wave (turning up the palm). The Anudhrutham is always a single unit and the action is a clap (or beat). The Laghu has varying number of units indicated by the 'Jaathi' or class of the thaalam. The possible units for Laghu are 3 (thisra), 4 (chathurasra), 5 (khanda), 7 (misra) and 9 (sankeerna). The action for Laghu is a clap followed by counts (number of counts is one less than the total jaathi value so that clap and counts together account for the number of units of the jaathi). The order and number of the components (angams) of the thaalam are fixed by the thaalam name. Thus Thriputa thaalam has a laghu followed by 2 druthams. If it is charhurasra jathi thriputa thaalam it will have a laghu of 4 units, and 2 druthams of 2 units each totaling eight units in a cycle.
The symbols for the three Angams of the thaalam are:
Laghu - a vertical line (or digit 1) followed by the number of units indicated by the jaathi ex. |4
Dhrutham - A circle O
Anudhrutham - A half circle U
These symbols are often omitted.
When more than one rhythmic cycle is shown on one line double vertical lines are drawn to separate them. In the sample below there are 3 rhythmic cycles in one line.
The notation is written using the the solfa symbols 'sa ri ga ma pa da ni' (corresponding to 'doh re me fa so la te'). Normally the notes represent the middle octave. A dot over the note indicates the higher octave and a dot below the note indicates the lower octave. Generally the compositions cover a range from ma of the lower octave up to pa of the higher octave - usually even less.
There is no absolute time measure. A note written as sa or ri takes one 'maathra' which may be equal to the unit duration of the thaalam frame work itself or be a sub-multiple of it. A common convention uses 4 notes per basic unit of the thaalam. In the sample below 2 notes are used per unit of the thaalam which itself has 6 units (a dhrutham of 2 units and a laghu of 4 units). Thus in the sample one cycle has 12 notes (after accounting for half notes etc.)
When the note vowel is doubled as in 'saa' or 'ree' the note is held for twice the duration of the single note 'sa' or 'ri'. This convention is always used while writing notation in Tamil or Telugu but some books published in English use the notation 'S R G M P D N ' to represent notes of single time unit and they cannot double the time by adding vowels
To prolong a note further, or to indicate periods of silences (especially in the beginning of a rhythmic cycle) the symbols "," (comma) and ";" (semicolon) are used. A comma signifies one note duration and a semicolon 2 notes duration. In the English publications which use 'S R G M P D N' a 2 note saa is written as "S,". In some others a symbol like 's' or 'r' in small letters indicates single note and 'S' or 'R' in caps indicates 2 notes.
Half notes and quarter notes are indicated by drawing lines over the notation. A single line halves the duration of the notes and a double line makes it one fourth.
Sample notation sheets are given below in Tamil and English - If the images below are not shown please CLICK HERE
 
Same notation as above in English script (with explanation of symbols)