The green plant with the three heart-shaped leaves stands for Ireland and St. Patrick's Day. Symbol for the cross and the Trinity, nature and Ireland. The English term "shamrock" comes from the Irish word for plant (seamróg).
The shamrock emoji was introduced in 2005 and released as part of the Unicode 11.0 standard. This emoji can be found under the animals and nature
category. Because the shamrock emoji has been around for quite some time, it should display correctly in the majority of operating systems.