allograph การใช้

These are not independent letters, but rather allographs.
Such suspected allophones / allographs are listed on a common row in the table below.
There is some disagreement as to whether capital and lower-case letters are allographs or distinct graphemes.
Several such variants have distinct code points in Unicode and so ceased to be allographs for some applications.
These allographs, called " kar ", are diacritical vowel forms and cannot stand on their own.