™ (for an unregistered trade mark, that is, a mark used to promote or brand goods)
® (for a registered trademark)

Source: http://en.wikipedia.org/wiki/Trademark

Tiki® and TikiWiki® are registered trademarks of the Tiki Software Community Association.

The Logo needs updating from ™ to ®

Related links

• http://opensource.com/law/10/8/trademarks-%E2%80%93-good-bad-and-ugly
• http://www.smarty.net/files/SmartyTrademark.pdf
• Tiki Legal Team

The trademarks are valid until 2023 with the USPTO

• Trademarks