hash_mark has definitions from the field of psychology
1
[ noun ] (psychology) an insignia worn to indicate years of service

Used in print

(William S. Haymond, "Is Distance an Original...)

This meant , concretely , that the patient could not read at_all without making writing like movements of the head or body , became easily confused by `` hasher_marks '' inserted between hand-written words and thus confused the mark for one of the letters , and could recognize a simple straight_line or a curved one only by tracing it .

Related terms

insignia

*