The harp, a basic stringed musical instrument, is a popular symbol in Ireland in particular (cláirseach). It is featured in the Flag of Leinster which has the ISO 3166-2 code IE-L and can therefore be encoded as an Emoji Tag Sequence (although support for these is explicitly optional).

Standard References

• Unicode Technical Standard 51 “Unicode Emoji” (beta)
• How to propose emojis to Unicode
• How to propose other additions or changes to Unicode (required form, email address: docsubmit＠unicode.org)
• Unicode document submission form