[Tinyos-help] What does the "&" operator stand for?

[Muhammad Azhar]

Hi,

  What does the "&" operator stand for? Eg:

uint16_t x;
//let x = some value
if (x & 0x0001) { /* do something */}
else if (x & 0x0004) {/* do something else */}

  I have tried to find this syntax on the Net, but I'm really unable to find 
one that explains what it means.  In C, I understand that it has to do with 
pointers, but the syntax is "&pointer" (no spacing), hence, I'm really 
clueless what this does.
  I'm trying to obtain sensor readings and linking the output of the value 
of the temperature readings to the Leds.
  Thanks in advance.

Regards,
Azhar