\begin{array}{ll}
\text{uacute} & u \\
\text{Uacute} & U \\
\text{uarr} & \uparrow \\
\text{uArr} & \Uparrow \\
\text{Uarr} & \\
\text{Uarrocir} & \\
\text{ubrcy} & u \\
\text{Ubrcy} & U \\
\text{ubreve} & u \\
\text{Ubreve} & U \\
\text{ucirc} & u \\
\text{Ucirc} & U \\
\text{ucy} & u \\
\text{Ucy} & U \\
\text{udarr} & \\
\text{udblac} & u \\
\text{Udblac} & U \\
\text{udhar} & \\
\text{ufisht} & \\
\text{ufr} & \mathfrak{u} \\
\text{Ufr} & \mathfrak{U} \\
\text{ugrave} & u \\
\text{Ugrave} & U \\
\text{uHar} & \\
\text{uharl} & \upharpoonleft \\
\text{uharr} & \upharpoonright \\
\text{uhblk} & \\
\text{ulcorn} & \\
\text{ulcorner} & \\
\text{ulcrop} & \\
\text{ultri} & \\
\text{umacr} & u \\
\text{Umacr} & U \\
\text{uml} & " \\
\text{UnderBar} & \_ \\
\text{UnderBrace} & \underbrace{} \\
\text{UnderBracket} & {} \\
\text{UnderParenthesis} & \\
\text{Union} & \bigcup \\
\text{UnionPlus} & \uplus \\
\text{uogon} & u \\
\text{Uogon} & U \\
\text{uopf} & \mathbb{u} \\
\text{Uopf} & \mathbb{U} \\
\text{uparrow} & \uparrow \\
\text{Uparrow} & \Uparrow \\
\text{UpArrow} & \uparrow \\
\text{UpArrowBar} & \\
\text{UpArrowDownArrow} & \\
\text{updownarrow} & \updownarrow \\
\text{Updownarrow} & \Updownarrow \\
\text{UpDownArrow} & \updownarrow \\
\text{UpEquilibrium} & \\
\text{upharpoonleft} & \upharpoonleft \\
\text{upharpoonright} & \upharpoonright \\
\text{uplus} & \uplus \\
\text{UpperLeftArrow} & \nwarrow \\
\text{UpperRightArrow} & \nearrow \\
\text{upsi} & \upsilon \\
\text{Upsi} & \\
\text{upsilon} & \upsilon \\
\text{Upsilon} & \Upsilon \\
\text{UpTee} & \bot \\
\text{UpTeeArrow} & \\
\text{upuparrows} & \upuparrows \\
\text{urcorn} & \\
\text{urcorner} & \\
\text{urcrop} & \\
\text{uring} & u \\
\text{Uring} & U \\
\text{urtri} & \\
\text{uscr} & \mathcal{u} \\
\text{Uscr} & \mathcal{U} \\
\text{utdot} & \\
\text{utilde} & u \\
\text{Utilde} & U \\
\text{utri} & \vartriangle \\
\text{utrif} & \\
\text{uuarr} & \upuparrows \\
\text{uuml} & u \\
\text{Uuml} & U \\
\text{uwangle} & \\
\end{array}
