I have a key to type ⌘ on my keyboard (though it doesn’t work in the MCE editor!  So I copied it from Notepad++ after typing there) which is handy for writing things like “Type ⌘B to rebuild the project.”  This is technically called the Place of Interest Sign.  But searching for clover in BabelMap gives me U+1F340 which may show up as (🍀) if you have a suitable font installed. There is also a Shamrock, (☘), with three leaves.