silly Qs, but thought provokin'

what types of bonds does d and f orbitals form?????

i mean to ask, sigma or pi..........

if we see a book regarding differences in both, point is sigma formed by 3 types(u wud b knowing). pi by 1 type only...

but there is no mention of d and f orbital..........

i knoe its not imp 4 monday's exam, but still.........