Как называется круг перечёркнутый крестом ? ( Фото в описании)

Знак Слендера\Символ Оператора

Появившиеся видеодневники Marble Hornets оказали на его мифологию значительное влияние: так, оттуда пришел знаменитый «символ Оператора» — круг, перечёркнутый крестом.

The Operator Symbol is a circle with an "X" drawn through it: Ⓧ. It has not been revealed what it represents or what its function is except that it is somehow connected to the Slender Man/Operator. It was first depicted within the MarbleHornets series and has since appeared in many other Slender Man series as well, including TribeTwelve and DarkHarvest00.

Since it was used in MarbleHornets, its popularity has led it to be synonymous with Slender Man by the online community.