field code

operation code field

operation field code

sub-field code

code， operation field

field control code

field data code

field terminator code

code Code No

multi-code code detection

sigma field (σ-field)

Residual magnetic field/field

Magnetic field/field

accept code register and mask code register

bar code， bar code reader

binary-code decimal code

Bose-Chaudhuri-Hooguenghem code (BCH code)

chip code error code

code for code compatibility