Bass Guitar Tablature contains some other symbols, since basses are played in multiple ways. Often, funk and progressive bass lines use 'unorthodox' read: not used in pop music methods to extract sound from a bass. These include, but are not limited to:

s or t (thumb) - slap, as in |-5s--3s-|
p - pop, as in |-7p--5p-|
L - left hand tap, which is shown above the notes you play
R - right hand tap, which is shown above the notes you play
V or \/- flamenco downstroke, shown above played notes
^ or /\- flamenco upstroke, shown above played notes
x - muted note (sometimes a muted slap or left hand tap)

Example: Tommy the Cat by Primus
               V                             V ^ 
g|----------|--4---------------------------|-3/4----------------------|
d|----------|*-4---------3h5--5s-5s-5s-0s-*|-3/4---------3h5--5-5-5-0-|
a|----------|*----------------------------*|--------------------------|
e|-3s-/-10\-|----0h3-x-x-----5s-4s-3s-0s---|-----0h3-x-x-----5-4-3-0--|