Heart, Rose, and Doves/Love Birds
Hearts can symbolize the selfless act of giving everything to someone you love and it is literally what gives you life so hearts can be seen as very romantic which is what Valentine's Day is all about
A rose is a very traditional gift, but a red rose especially is associated with passion and strong loving emotions.
Since doves and pigeons mate for life, they represent loyalty, fidelity and love. Lovebirds get very cozy with each other and cannot survive without the other, and it has also been a popular belief that birds chose their mate for the year on February 14.