The heart shape is the symbol of love. The orange heart may represent a half-hearted love or you do not want to have a relationship but just be friends.
The orange heart emoji was introduced in 2017 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions
category. Because the orange heart emoji has been around for quite some time, it should display correctly in the majority of operating systems.