To specify which airline a ticket will be issued on behalf of.
to categorise stamps based on their position on the original sheet, in order to reconstruct an entire sheet.
(particularly with early British stamps) to identify the printing plate used.
Origin
Middle English, from Old French plate, from Medieval Latin plata, from Vulgar Latin *plattus, from Ancient Greek πλατύς ("broad, flat, wide"). Compare Spanish plato.
Middle English, partly from Anglo-Norman plate and partly from Latin plata ("silver"), from Vulgar Latin *platta ("metal plate"), from feminine of Latin *plattus ("flat").
From Spanish plata.
Modern English dictionary
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