The two single-edged swords (or ‘kirpan’) on either side of the Khanda symbol represent the dual characteristics of human existence. These are given as ‘Miri’, the temporal nature of life, and ‘Piri’, the spiritual side of existence. They are crossed at the bottom to indicate that these two characteristics influencing the soul are integrated, not two separate entities.
The double-edged sword (‘khanda’) symbolises the ability of Truth to cut through the duality of illusion (‘maya’).
The circle (‘chakkar’) represents unity – a sense of being at one with Infinity.
The Kara has been worn for centuries as an Amulet of Protection. “It guards you from the outside, and also from the inside. The Kara reminds you not to do evil with your hands, and thus protects you from Karma. It is also like wearing an energetic soldier on your wrist, deflecting negative energy away from your aura.” https://blog.spiritvoyage.com/kara-the-protection-bracelet/
These energetic-magnetic effects strengthen the male (or active) energy when worn on the right wrist. When worn on the left wrist they strengthen the female (or receptive) energy.
Yogi Bhajan taught that wearing a Kara balances energy centres and protects the wearer from harm.