For me Google does indeed return Uranium One, Inc.(TSE:UUU). WolframAlpha on the other hand interprets the query correctly and provides sensible alternatives:
Assuming "UUU" is a financial entity | Use as an airport instead
For me, Google also returned Uranium One, trading on the Toronto Exchange.
However, Yahoo Finance showed Universal Security Instruments trading in New York, Uranium One in Toronto, and some wireless company trading on six different exchanges. The only symbol without a dot qualifier was the one for Universal Security Instruments.
Assuming "UUU" is a financial entity | Use as an airport instead
Assuming AMEX:UUU | Use ZA:UUU instead