Deck

The word 'Deck' (with an upper-case 'D') indicates a specific Deck of the Nostromo (A, B, or C). Location cards must connect to the appropriate Deck, which is listed in the upper-right corner of the card. It is between these Decks that Air Shaft and Ladder cards are played.

Conversely, 'deck' (with a lower-case 'd') denotes a deck of cards on the table (draw deck, or discard deck).