Yahoo, using statistical analysis from a product called The Signal, is calling the race for Barack Obama, projecting the president to top Mitt Romney by a vote of 303 to 235 in the electoral college.

FORBES: Yahoo's Signal Predicts Presidential Election: Obama Over Romney

Or how about a Sidekick LX, which boasts a kicky high-def screen and "mood lights" that change color to signal just who's calling.

FORBES: Magazine Article

The roads are bumpy but negotiable, the markets are full of traders, the citizens of the land of liberty are swarming home from every refugee corner and every life of exile as if a silent migratory signal has been set off calling them back to their nests.

BBC: African view: Land of liberty?

Calling Tripp could be a signal to Lewinsky's lawyers to get serious about a deal or have their client face charges.

CNN: Tripp's Turn to Talk

Even if you're calling someone next door, the cellular signal must first travel to the local cell tower before being routed to your neighbor's phone.

FORBES: Motorola Moves Into Mesh

President Obama has tried to engage with America's long-time foe, Iran, issuing a video address to both the people and leaders of Iran and calling the country by its official name, the Islamic Republic Iran, to signal that Washington was not seeking regime change.

BBC: Obama's first 100 days: Foreign policy

"He was calling the people on the bench in between points to find out because they cut the TV signal in the hotel he is staying at, " Lopez revealed.

BBC: Lopez draws Spain level in final