Added 7 October 2026 iou symbol Categories: Money & PropertyRare Words symbol ! Definition from Wiktionary (CC BY-SA). More about iou at Wordnik → Where our words come from → ISO 639-3 language code for Tuma-Irumu. Related Words: markerchitnonnegotiablenonissuernonsignatorynonpersonno-loadnoninterestnonqual Back to today's word