We don't tell you what the autocomplete shortcuts are for emoticons which are embedded on pages.

If you use the dialog Insert > Emoticon we show you this:

However once you embed it on the page, we don't give you any tooltip on viewpage of what the shortcut is.

A suggestion is to
1. Switch them to the AUI "chunky" tooltips style - give them more affordance. (see https://developer.atlassian.com/design/latest/tooltips.html)
2. Add the tooltips on viewpage