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.