.
Ua, Ub, Uc, Ud, Ue, Uf, Ug, Uh, Ui, Uj, Uk, Ul, Um,
Un, Uo, Up, Uq, Ur, Us, Ut, Uu, Uv, Uw, Ux, Uy, Uz, UNr
UP (complexity)
Uppsala Astronomical Observatory (UAO)
UPS (Ultraviolet photoelectron spectroscopy)
A - B - C - D - E - F - G - H - I - J - K - L - M -