Yea nah, a triangle pointing up with a dot in the middle is a permanent survey mark, a solid circle small circle with three lines projecting from the top is a temporary bench mark.Here is the note enlarged with a pound symbol, which I think pertains to each numerical victim or crime.
Under it is a symbol which is often used for the ordinance benchmark, used in surveying. A.M.S.L.
The circle with cross through it is often a symbol used by surveyors to denote a datum or pick up.
It looks like he wrote radians & inches than added # with the arrow at the bottom which is normal convention.