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  2. Bourbaki dangerous bend symbol - Wikipedia

    en.wikipedia.org/wiki/Bourbaki_dangerous_bend_symbol

    The dangerous bend or caution symbol ☡ (U+2621 ☡ CAUTION SIGN) was created by the Nicolas Bourbaki group of mathematicians and appears in the margins of mathematics books written by the group. It resembles a road sign that indicates a "dangerous bend" in the road ahead, and is used to mark passages tricky on a first reading or with an ...

  3. Traffic warning sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_warning_sign

    Vienna Convention dangerous bends sign (diamond-shaped) New Zealand double sharp curve to the left sign. These signs indicate that dangerous or unexpected bends in the road are ahead. Signs typically indicate whether the curves are to the right or to the left, the angle of the curve and whether it is one curve or a series of curves.

  4. Hazard symbol - Wikipedia

    en.wikipedia.org/wiki/Hazard_symbol

    The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation.

  5. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).

  6. Manual on Uniform Traffic Control Devices - Wikipedia

    en.wikipedia.org/wiki/Manual_on_Uniform_Traffic...

    The U.S. adoption of several Vienna Convention-inspired symbol signs during the 1970s was a failure. For example, the lane drop symbol sign was criticized as baffling to U.S. drivers—who saw a "big milk bottle"—and therefore quite dangerous, since by definition it was supposed to be used in situations where drivers were about to run out of road and needed to merge into another lane ...

  7. Traffic sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_sign

    Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .

  8. Opinion: The chaos on the right is dangerous for Democrats too

    www.aol.com/opinion-chaos-dangerous-democrats...

    The split screen between President Joe Biden in Tempe, Arizona and House Republicans on Capitol Hill this Thursday captured the rupturing fault lines of American politics, writes John Avlon.

  9. Road signs in Finland - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_Finland

    Road signs in Finland were formerly regulated in the Road Traffic Regulation (5.3.1982/182) ... Dangerous curve to right (formerly used ) Dangerous curve to left