A knot tied as a symbol of loyalty in love; a true-lovers' knot.(noun)
A knot or bow of ribbon given or worn as a sign of loyalty or affection, or as a decoration.(noun)
The Century Dictionary (Public Domain)
Use "love-knot" in a sentence
"Plaiting a dark red love-knot into her long black hair."
"We have adroitly defined the infinite in arithmetic by a love-knot, in this manner ∞; but we possess not therefore a clearer notion of it."
"Go pour a whisky, close the curtains and light a candle, for Bess the landlord's daughter, 'the land lord's black-eyed daughter, plaiting a dark red love-knot into her long black hair'."