ISO IEC 16023:2000 pdf download – Information technology — International symbology specification — MaxiCode. 4.4.4.3 Lock-In Character A Lock-In Character, following a Shift Character for the same Code Set has the effect of behaving as a Latch Character. The Code Set remains in effect until a Latch Character is invoked. 4.4.4.4 Double Shift Characters A Double Shift Character (referred to as [2 Shift A]) is used to switch from Code Set B to Code Set A for the next two characters following the [2 Shift A] Character. Subsequent characters shall revert to Code Set B. 4.4.4.5 Triple Shift Character A...