Vanilla game
From Elite Wiki
This is the basic game without any added OXPs. If you choose Strict Game when you start up Oolite, this will constrain you to the vanilla game, excluding whatever OXP/OXZs you may have loaded.
The strict game before Oolite v.1.80 was a mildly modified version of Classic Elite and also without Fuel Injectors, anti-ECM missiles, shield boosters, scanner targeting enhancements, contract hauling, cargo bay screen, no shipyard, no navigation beacon, no stopping at a standstill, etc. etc.).
Cim started the process of changing the strict game away from this. See discussion here.
