Trillian may refer to:

• Trillian (character), a fictional character in The Hitchhiker's Guide to the Galaxy
• Trillian (software), a computer program named after the fictional character
• Trillian, a triangular type of modified brilliant cut in gemstones
• Project Trillian, an effort to port the Linux kernel to the Intel IA-64 architecture
• Trillians, the name of a rock bar in Newcastle, England

Zooey Deschanel as Trillian from the film adaptation. ... This article is about the instant messaging client. ... In order to best utilize a diamond gemstones superlative material properties, a number of different diamond cuts have been developed. ...

See also

• Trillion, a similar-sounding word

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