U.P. United Presbyterian.
up. Upper.
U.S. United States; United Service.
u.s., ut supra=As above.
U.S.A. United States of America; United States Army.
U.S.C. United States of Colombia.
U.S.N. United States Navy.
U.S.S. United States Ship or Steamer.
usu. Usually.
u.s.w., und so weiter (Ger.)= And so forth.