to install an old orthography Malayalam Unicode font which is required to read the posts below]
At least, 3 of the chillu forming consonants have half-forms different from chillus. As the first example, half-na is highlighted in this image:
![](http://photos1.blogger.com/blogger/1048/152/400/na-half-form.jpg)
Notice that half-na is not chillu-na. Below, we can see the half-consonant in action forming conjuncts with various characters:
![](http://photos1.blogger.com/blogger/1048/152/400/half-na-examples.jpg)
Simillar to ന(NA), ക (KA) and ണ (NNA) also have following half-forms:
![](http://photos1.blogger.com/blogger/1048/152/400/half-Na.jpg)
Their conjunct formation examples are:
![](http://photos1.blogger.com/blogger/1048/152/400/ktha.jpg)
![](http://photos1.blogger.com/blogger/1048/152/400/Nma.jpg)
![](http://photos1.blogger.com/blogger/1048/152/400/NDa.jpg)