Terry's Chocolate Orange typically has 20 segments. This is the standard count for the original orange-shaped chocolate ball, designed to resemble a real orange with 20 “slices,” and it’s common across many variations of the product (including the original and related variants that maintain the segment motif).
If you’re asking about a specific packaging size or a variant, some newer or regional editions may use different counts, but the classic Terry’s Chocolate Orange is 20 segments.