.. indented paragraph, no spaces between the items, bold font
.tm arg 1 \\$1 arg 2 \\$2 arg 3 \\$3
.nr PS \\n(ps .nr ps 0 .ns .ip "\\$1" \\$2 .nr ps \\n(PS

.. start nested .IP
.ba +5n .. end nested .IP
.ba -5n .. nested .IP, no spaces, normal font
.tm arg 1 \\$1 arg 2 \\$2 arg 3 \\$3
.nr PS \\n(ps .nr ps 0 .ns .ip "\\$1" 9n .nr ps \\n(PS .. typewriter font
\fC\\$1\\$2 .. ex/vi names in command font
\fB\\$1/\\$2\\$3 .. command names
\fB\\$1\\$2 .. key words for index
.sy echo >>index '\\$1 \\n%' .. option names
\fB\\$1\\$2 .. paren quoted (typewriter font)
(\*(lq\\$1\*(rq)\\$2 .. quoted bold
\*(lq\\$1\*(rq\\$2 .. quoted command
\*(lq\\$1\*(rq\\$2 .. quoted option
\*(lq\\$1\*(rq\\$2 .. quoted (no font change)
\*(lq\\$1\*(rq\\$2 .. quoted (typewriter font)
\*(lq\\$1\*(rq\\$2 .. section macro to build TOC
.(x \\$2 .)x .sh \\$1 "\\$2" .. manual section
\fI\\$1(\\$2)\\$3 ..