What font package do I use to get the vertical Russian/German style integral signs? (subject says all)
The German one can be produced with the
wasysym package. More precisely, if loaded without arguments, then the package provides a
\varint command for the upright integral. If loaded with the
integrals option, it overrides the normal
The integrals from
mathabx (it redefines
\int) are beckwards slanted when used in inline style and upright when in display style.
According to detexify, the German one (upright, according to Wikipedia) is in the font package tipa as the command
\textesh, but there it's regarded as a phonetic symbol so is a text character. That means that it won't behave correctly as is in mathematics: that is, it won't stretch and it won't have the limits in the right place. However, it could (probably) be converted to one.
The closest detexify gives for the Russian one is
\rbag in the stmaryrd package, but it looks a little odd at the bottom.