21U, Kadıköy-Uğur Mumcu güzergahında çalışan belediye otobüsünün hat numarasıdır 14.
Ayrıca, "U21" kısaltması 21 yaş altı anlamına gelir 25. Bu terim, Türkiye Futbol Federasyonu tarafından düzenlenen eski U21 Ligi'nde de kullanılmıştır 23.
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