Board Thread:General Discussion/@comment-34259286-20180108023214/@comment-109.145.140.86-20180721084308

You have the symbol the wrong way round. It should be rotated 90 degrees anti-clockwise.

From http://dragonball.wikia.com/wiki/Symbol it's the fourth symbol from top.

Master Roshi's kanji, 亀, pronounced kame and meaning "turtle", is the kanji that all of those trained under Master Roshi are given to wear after completing their training.