прокладка

Etymology
Senses 5 and 6 refer to the protest flags' similar appearance to a menstrual pad.

Noun

 * 1) laying, building, construction
 * 2) packing, lining, gasket
 * 3) sanitary napkin, sanitary towel
 * 4)  a fraudulent business that steals money from customers
 * 5)  the white-red-white flag of Belarus, formerly the national flag, used to protest Alexander Lukashenko's government
 * 6)  the white-blue-white flag used in Russia to protest the 2022 invasion of Ukraine

Synonyms

 * (former flag of Belarus)
 * ,, (anti-war flag in Russia)