These characters were found in a recent ios vulnarability. The webpage contains the below characters.
Few characters:
ţ̴̨̢̨̨̧̧̨̡̡̡̡̨̢̛̛̛̪͇͕̱̼̦̦̝̯̪̗̠̞̪̤̲̫͎̫͉͍̪̗̬̣̺͓̞̩͇͖̯ ţ̴̨̢̨̨̧̧̨̡̡̡̡̨̢̛̛̛̪͇͕̱̼̦̦̝̯̪̗̠̞̪̤̲̫͎̫͉͍̪̗̬̣̺͓̞̩͇͖̯ ţ̴̨̢̨̨̧̧̨̡̡̡̡̨̢̛̛̛̪͇͕̱̼̦̦̝̯̪̗̠̞̪̤̲̫͎̫͉͍̪̗̬̣̺͓̞̩͇͖̯ ţ̴̨̢̨̨̧̧̨̡̡̡̡̨̢̛̛̛̪͇͕̱̼̦̦̝̯̪̗̠̞̪̤̲̫͎̫͉͍̪̗̬̣̺͓̞̩͇͖̯
Edit:
subquestion: Can we restrict users from entering such characters?