Letters on a party invitation indicating that booze won't be provided by the host

• "We're not supplying liquor"
• Party letters
• Letters on an invitation
• Abbr. on some invitations
• Inits. on a party invitation
• Party spec
• Like many restaurants without a liquor lic
• Drinker's party instruction, for short
• Part of an invitation to an imbiber

Wikipedia Word definitions in Wikipedia
BYOB or BYO is an initialism meant to stand for "bring your own booze", "bring your own bottle", "bring your own beer" or "bring your own beverage". BYOB is often placed on an invitation to indicate that the host will not be providing alcohol and that guests ...