Pb

noun

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

   noun.substance

   Synonyms atomic number 82 lead

   Source: WordNet 3.0

2. a unit of information equal to 1000 terabits or 10^15 bits

   noun.quantity

   Synonyms pbit petabit

   Source: WordNet 3.0

3. a unit of information equal to 1000 terabytes or 10^15 bytes

   noun.quantity

   Synonyms petabyte

   Source: WordNet 3.0

4. a unit of information equal to 1024 tebibytes or 2^50 bytes

   noun.quantity

   Synonyms pebibyte petabyte pib

   Source: WordNet 3.0