TeX/fi

Description
The \fi command is used to signal the end of the following if-then-else control structures:
 * \if
 * \ifcase
 * \ifcat
 * \ifdim
 * \ifeof
 * \iffalse
 * \ifhbox
 * \ifhmode
 * \ifinner
 * \ifmmode
 * \ifnum
 * \ifodd
 * \iftrue
 * \ifvbox
 * \ifvmode
 * \ifvoid
 * \ifx