The symbol has a love word in its name: heart, hearts, heartbeat, love, lovebirds, loveberry, lovestruck, loving, cupid, kiss or valentine (Love Dove counts).
In Giftroll, this comes up 1 in 37 a roll. It's one of 9 badges in its family, and a roll counts at most one of them.
A gift a day, free, no account needed.