as: ARM-Chars
9.4.2.2 Special Characters
..........................
The presence of a '@' anywhere on a line indicates the start of a
comment that extends to the end of that line.
If a '#' appears as the first character of a line then the whole line
is treated as a comment, but in this case the line could also be a
logical line number directive (Comments) or a preprocessor
control command (Preprocessing).
The ';' character can be used instead of a newline to separate
statements.
Either '#' or '$' can be used to indicate immediate operands.
*TODO* Explain about /data modifier on symbols.