utf8mb4

gistfile1.sql

// refer: 
// http://zh.wikibooks.org/wiki/Unicode/20000-20FFF
// http://dev.mysql.com/doc/refman/5.0/en/string-functions.html
// https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-upgrading.html

mysql> create table test_x (value varchar(100)) default character set utf8mb4;
Query OK, 0 rows affected (0.04 sec)

mysql> insert into test_x values('𠀳');
Query OK, 1 rows affected, 1 warnings (0.01 sec)

mysql> select length(value),char_length(value) from test_x;
+---------------+--------------------+
| length(value) | char_length(value) |
+---------------+--------------------+
| 4             | 4                  |
+---------------+--------------------+
1 rows in set (0.01 sec)