Je was op zoek naar: ordinal (Engels - Wels)

ordinal
@ item: inlistbox a subtype of the grammatical word type: numeral cardinal (one, two, three,...)

ordinal number
trefnol

the difference being the movement of the ordinal number from preceding the object to succeeding it.
yr hyn sy'n wahanol yw fod y trefnolyn yn newid o fod o flaen y gwrthrych i fod ar ei ôl.

in cases such as this, it is important that the user interface provided is neutral to this issue by not requiring a fixed relationship between the ordinal number and the object.
mewn achosion or fath, maen bwysig fod y rhyngwyneb defnyddiwr a ddarperir yn niwtral mewn perthynas âr mater hwn trwy beidio â chael perthynas osodedig rhwng y trefnolyn ar gwrthrych.

ordinals
trefnolion