These emojis represent various religions from all over the world. Here are Latin and Orthodox crosses, crescent moon, David's star. Apart from that, you can find symbols related to the Eastern faith — Yin Yang, wheel of Dharma, Om symbol.
So how did the pacific symbol and atom end up in this emoji set? 🤔 God knows...
Let's not fuss over the logical explanation for everything. Let's just keep praying for the righteous course of events. The almighty Lord knows better. Amen ⚛