green box

noun3

1. •
   A class of subsidies allowed by the World Trade Organization understood to cause minimal disruption to trade.
2. •
   A device used in phreaking to produce various tones (coin collect, coin return, and ringback) that allow illicit control of a payphone.
3. •
   (historical) An upper box in a theatre.

   • And we shall sit in the gallery green-box. — 1748