Depending on how you wear a claddagh ring, the meaning changes:
On the right hand with the point of the heart toward the fingertips: the wearer is single and might be looking for love.
On the right hand with the point of the heart toward the wrist: the wearer is in a relationship; someone "has captured their heart"
On the left ring finger with the point of the heart toward the fingertips: the wearer is engaged.
On the left ring finger with the point of the heart toward the wrist: the wearer is married.
Though don’t let the rules stop you if you prefer how it looks a certain way!