I got mathematical surfaces like https://en.wikipedia.org/wiki/Conoid https://en.wikipedia.org/wiki/Conoid To get the correct image I had to search conoid stree

I got mathematical surfaces like https://en.wikipedia.org/wiki/Conoid https://en.wikipedia.org/wiki/Conoid To get the correct image I had to search conoid street. Anyway, I guessed they were those red cone shaped things that people put on the street and I'm not sure how they are call even is Spanish (probably conos or balizas).