That's not really a Thai character, right? It's way too many bytes! It must be an intentional repetition of stacking diacritics. Some of the ones in that Google result page are 21 bytes.
$ echo ก็็็็็็็็็็็็็็็็็็็ | hexdump
0000000 e0 b8 81 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 e0
0000010 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9
0000020 87 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87
0000030 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 e0 b9 87 0a
0000040
$ echo ก็็็็็็็็็็็็็็็็็็็ | wc
1 1 64 ก ็ ็ ็ ็ ็ก ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็ ็