What is the "Odessa step" in film development? thank you

Odessa terrace, located in Odessa, the capital of Odessa, is the largest port city and industrial, scientific, cultural and tourism center along the Black Sea. Odessa steps leading to the seaside were built in 1930s and 40s of 19, and were called "golden steps" to commemorate the uprising of the battleship potemkin in 1905. There are 192 steps in the "Potemkin Ladder", which widens step by step from top to bottom, echoing the statue of Li Sailiu, the founder of the city, in the semi-circular square in the city center. Standing at the highest place, you can have a bird's eye view of the beautiful Odessa Port. 1925, Soviet movie master Sergei Eisenstein directed the classic movie Battleship potemkin. In the film, "Odessa Steps Massacre" became one of the most classic clips in the film history, and "Odessa Steps" became the most famous ladder in the world because of this film. In this clip, Eisenstein successfully used the montage technique of vaudeville, highlighting the bloody atrocities of the czar's military and police in killing peaceful residents, including the elderly, the weak, women and children.