Letters that make IOU
o, i, u are letters that make 'IOU'
Words within IOU
Io are words within 'IOU'
o, i, u are letters that make 'IOU'
Io are words within 'IOU'
1 possible definitions for 'IOU'
Under this definition, iou is a noun and has the following properties:
'IOU' can be a type of note, promissory note, note of hand.