The phrase "upper chakras" refers to the energy centers in our body that are located above our heart. These chakras are responsible for higher states of consciousness, intuition, communication, and spirituality. Full definition
This is the central chakra, where the lower and upper chakras meet. (mindbodygreen.com)
This will increase your understanding and sensitivity, which will in turn gain you deeper access to the gifts of the more subtle upper chakras. (yogajournal.com)
The Anahata is your center, it connects your lower and upper Chakras together and brings the body together as one. (activatemychakras.com)