Danish road signs B 11 and UB 11,1, prescribing full stop ahead, as depicted in public notice on road signage (bekendtgørelse om vejafmærkning) § 14. In this illustration the sign is accompanied by B 11 (give way), but it can also be used with A 72 (level crossing without barriers ahead).
Bekendtgørelse om vejafmærkning (BEK nr 802 af 04/07/2012) https://www.retsinformation.dk/Forms/R0710.aspx?id=139507
Vejdirektoratet