This is an incomplete list of the symbols of Scientology, the Church of Scientology, and related organizations.
Trademarks
All official symbols of Scientology are trademarks held by the Religious Technology Center (RTC). They are said by the center to be used "on Scientology religious materials to signify their authenticity ... and provide a legal mechanism to ensure the spiritual technologies are orthodox and ministered according to Mr. Hubbard's Scripture. These marks also provide the means to prevent anyone from engaging in some distorted use of Mr. Hubbard's writings, thereby ensuring the purity of the religion for all eternity."
References
Symbols of Scientology Wikipedia(Text) CC BY-SA