Its standard symbol ⇱ from ISO/IEC 9995-7, i.e. U+21F1 ⇱ NORTH WEST ARROW TO CORNER, is used on some full-size keyboards instead of a possibly localized text label.
In macOS single line text fields, the key works like it does in DOS and MS Windows, going back to the days of dumb terminals, where Home moves to the start of the line.
In multiline word processors, when the key is pressed, the window scrolls to the top, while the caret position does not change at all; that is, the Home key is tied to the current window, not the text box being edited.
To get the same result as the Windows platform (that is, moving the insertion point to the beginning of the current line of text), one can press ⌘ Command+←.
Also, like Windows, the Home key can be used to select all the characters before the cursor in a certain line if pressed along with ⇧ Shift in editable text.