pb

noun ! Definition from WordNet 3.1, Princeton University. More about pb at Wordnik → Where our words come from →

1. A soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey.

   the children were playing with lead soldiers

2. A unit of information equal to 1000 terabits or 10^15 bits.
3. A unit of information equal to 1000 terabytes or 10^15 bytes.