Ukraine uses the ISO 3166-1 Alpha-2 country code UA. The two-letter code UA is widely used in international contexts (e.g., vehicle registration, data exchanges, and geopolitical references) to denote Ukraine. If you’re asking about the denotation in other systems, here are common equivalents you might encounter:

• Alpha-3 code: UKR
• Numeric code: 804

If you need the exact usage in a specific context (web APIs, travel docs, or vehicle registrations), specify the context and I’ll tailor the details.