how to denote signals and slots in UML?

Just wondering, if I was to denote signals or slots in a class
diagram, is there any special way to do it in umbrello so it shows up
a little different in the diagram? Is there a preferred way to note
them in UML?

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Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in  U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store 
http://p.sf.net/sfu/nokia-dev2dev