This is a relatively irrelevant and minor issue, but I've recently noticed that there are currently three emoji that Android and Google supports, but iOS and macOS don't: ♂️ MALE SIGN emoji, ♀️ FEMALE SIGN emoji and ⚕️ MEDICAL SYMBOL emoji. 

I've no idea why this is, but it seems like a rather specific but deliberate choice to exclude, which is why I've decided to start this petition for Apple to solve this issue.

All credit goes to Bernzrdo on Wikimedia Commons for the unofficial Apple Color Emoji designs in the campaign image.

Notes: a)  I've deliberately excluded the 🛌 Person In Bed Emoji in this petition, which does not support skin tone variations on iOS and macOS as well, but only because the head of the person is obscured in such a way that you are unable to see their skin colour. This is not the case for Android and Google, where the head of the person is fully displayed, and b) The ⏏️ Eject Button Emoji was briefly another one of Apple's "forgotten" emoji before being supported in iOS 11.1. For more information, read more about it here.