ILS Critical Area Holding Position Signs
White-on-red ILS sign marking where to hold so a taxiing aircraft doesn't disturb the instrument landing system signal.
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About ils critical area holding position signs
A taxiing aircraft or vehicle can distort the localizer or glide slope signal of an instrument landing system. Where ATC needs the ILS critical area kept clear, an ILS holding position sign — white ILS on red — stands beside the ILS holding position marking (the yellow ladder across the taxiway), and pilots hold there when instructed. Like every mandatory sign, its legend is white with a black outline on a red face.