I would suggest the abbreviation is Ly, for "Legally" - it would be relevant for an institution to note whether an inmate was merely insane or considered by the police or courts to be legally insane, for instance if an inmate could only be admitted against his or her will if legally insane.
EDIT: just saw RJ Palmer's examples of Qs and concur that Qy seems the better interpretation for now
EDIT: just saw RJ Palmer's examples of Qs and concur that Qy seems the better interpretation for now
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