ōrū
You saw ōrū in yesterday’s post. It means 100 in base 8, so 64 in base 10. An alternate form is ānoru which emphasizes the 1 in 100. The –ū suffix is used several times in numbers and kinda sorta means “squared”. And since ōr is the stem for 10 (or 8 in decimal form), ōrū is ōr squared.