1. one full impression of stamps taken from a printing plate; a typical sheet of US commemorative stamps is four panes each of 50 stamps, the sheet is then cut into four panes of stamps for eventual sale. the typical post office pane now appars to be 20 stamps.
2. bogen (German); feuille (French); foglio (Italian); hoja (Spanish).

Perforations are usually measured using a ^lsupplies/philatelic_tools/perforation_gauges,perforation gauge}. Paper ^lsupplies/philatelic_tools/perforation_gauges,perforation gauges} have rows of dots or a sawtooth arrangement where you line up the teeth of perforations of your stamp with the row of dots and read off the perforation count. Clear plastic ^lsupplies/philatelic_tools/perforation_gauges,perforation gauges} is also available. With it you can lay the gauge on the stamp (useful if it is on a cover). It also has slanted vertical lines on the plastic, when the perforations on the stamp line up with the lines, then you read the perforation count off of the gauge. It also has the advantage of being able to measure fractional perforations, like a 13.2 .