Help for emoji

Usage:  /emoji name|symbol

Show available emojis which match the requested name or symbol. The resulting 
Unicode value or symbol can be directly entered as input, or the emoji name can 
surrounded by colons to indicate you want the emoji with that name to be 
inserted into the input.

Looking up emojis by name can be controlled using /set emoji on the sender, and 
whether they are expanded is also affected by the value of /set unicode on the 
recipient. If the recipient has Unicode disabled, emoji names will be left as 
plain text (including the colons).

If an emoji is sent as binary UTF-8 or as an escaped Unicode value and the 
recipient has Unicode disabled, it will be displayed as an escaped Unicode 
value, which is harder for a recipient to recognize. So, using the emoji names 
surrounded by colons is preferable if you expect to have some recipients that 
don't support displaying emojis.