v.

send a signal by waving a flag or a light according to a certain code

signal by or as if by a flag or light waved according to a code

Save the wigwags!
Iconic wigwags survive after 80 years under Point Richmond's watchful eye
RAIL-HIGHWAY GRADE CROSSING SAFETY EVALUATION
Night Running
Coil cut-out for wigwag signals
HAPPILY EVER FASTER?
Railway Regulation (Gauge) Act 1846
INFORMATION TECHNOLOGY AS A TOOL FOR STRATEGIC MANAGEMENT SECTOR IN THE CLOTHING DEPARTMENT
Mr. Straw's Small Engine Repair
Formation of dimeric σ-bonded argentacarboranes containing two types of closed and open Ag-H-B bridge bonds and molecular structure...