pb

symbol

the chemical element lead.

1. short for personal best.

   she took another half a second off her PB in the Olympic heats

1. petabyte(s).
2. paperback.

   hb £16.99, pb £7.99

3. Punjab.

1. a soft, heavy, ductile bluish-grey metal, the chemical element of atomic number 82. It has been used in roofing, plumbing, ammunition, storage batteries, radiation shields, etc., and its compounds have been used in crystal glass, as an anti-knock agent in petrol, and (formerly) in paints.
2. an item or implement made of lead.
3. graphite used as the part of a pencil that makes a mark.

   scrawls done with a bit of pencil lead

4. a blank space between lines of print.

Old English lēad, of West Germanic origin; related to Dutch lood ‘lead’ and German Lot ‘plummet, solder’.

noun

a unit of information equal to one thousand million million (10¹⁵) or, strictly, 2⁵⁰ bytes.