[31] It Kan zijn also used occasionally in books by religious authors, but most books for adults use the international symbol +. Unicode has this symbol at position 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 When placed after special sets ofwel numbers, plus and minus signs are used to indicate that only positive numbers https://www.webwiki.ch/foliemolie.nl/