Wiktionary
usu.
a. Abbreviation of usual adv. Abbreviation of usually
Usage examples of "usu.".
As he passed an open office door, he glanced in and saw a T'swa medic named Usu. On an impulse he stopped.
Hiram didn't want Tyre dependent on boats from Usu, nor linked to the mainland by an extended aqueduct that could serve an enemy as a bridge.
Be that as it may, they did no harm, they were only curious, oh, how curious about every least thing in Usu, and about the plans that were then being drawn up for Tyre.