MySQL 5.5.3+ (2010-03) / MariaDB 5.5+ (ok for Ubuntu 12.04 LTS, Debian 7 Wheezy, Fedora 15, CentOS 7, ...).
To allow Unicode chars stored as 4 bytes in UTF-8 such as emojis 💩 💕 💖 😇 ☀️ 🌈 ...
https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html
https://mathiasbynens.be/notes/mysql-utf8mb4