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A stone is an uncommon type of triangulation mark in the OSGB36 list. In T:UK they are classified as Intersected Stations. There are 4 instances as follows:

T:UK Station name Order Computed Block
TP7901 Brent Knoll 3 1944 ST57
TP10022 Chars Stone 3 1955 NH54
TP10024 East Breakwater North End 3 1943 NT48
TP10023 West Breakwater East End 3 1943 NT48

Only Brent Knoll still exists. The other three marks have been destroyed; it is assumed that each had a distinct reference point or feature which defined the mark location.