ETYM French prop., a little piece of paper, or a mark or title, affixed to a bag or bundle, expressing its contents, a label, ticket, Old Fren. estiquete, of German origin; cf. LG. stikke peg, pin, tack, stikken to stick, German stecken. Related to Stick, Ticket.
Rules governing socially acceptable behavior.
See netiquette.

ETYM French protocole, Late Lat. protocollum, from Greek, the first leaf glued to the rolls of papyrus and the notarial documents, on which the date was written; protos + kollan to glue.
1. Forms of ceremony and etiquette observed by diplomats and heads of state.
2. Code of correct conduct.