A twice folded card.
Does this mean that when you open it, it has 4 compartments?
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It is ambiguous; the card could have been folded once, unfolded, and then refolded along the same crease. Or it could have been folded once into (approximately) halves and then a second time, while folded, to make quarters. Or it could have been folded into thirds.
Without further context or explanation, no option seems more likely than any other.