A 'Wire' is an uncommon type of 3rd order triangulation mark.
7 instances are recorded in the OSGB36 list  and all are associated with Colliery headgear. In T:UK the 'Wire' marks, along with marks of other types, occur within 4 triangulation stations. These stations have all beeen destroyed and there are no known photographs.
The trig stations which included these 'Wire' marks were:
|TP16550||Algernon Colliery Headgear, West Rope||3||1947||NZ29|
|TP16550||Algernon Colliery Headgear, East Rope||3||1947||NZ29|
|TP14654||Reedley Colliery Shaft, West Wire||3||1949||SD74|
|TP14654||Reedley Colliery Shaft, East Wire||3||1949||SD74|
|TP17196||Rishton Colliery Shaft, South Wire||3||1949||SD74|
|TP17196||Rishton Colliery Shaft, North Wire||3||1949||SD74|
|TP18738||Watnall Colliery, Wire Centre||3||1938||SK54|