Entering those characters in the search box on Graphmenica will take you to this page, showing the different characters being used:
- ก thai character ko kai (Unicode code point: U+0E01)
- ิ thai character sara i (Unicode code point: U+0E34)
- ็ thai character maitaikhu (Unicode code point: U+0E47)
- ้ thai character mai tho (Unicode code point: U+0E49)
