Usually, many TeX commands are abbreviations of some English words. For instance,
\hline stands for horizontal line,
\frac stands for fraction,
\neq stands for not equal, etc.
What do the commands for matrix brackets (
\bmatrix) stand for? I guess pre-letter
v means vertical (for determinants), but I have no idea about the other two.
I'm eager to know the longhands since this helps me work more naturally and faster.