Bregma is the name given to the junction of the
Bregma:

Bregma is the meeting point between coronal and sagittal sutures.
Seen in norma verticalis view of skull.
In foetal skull, this is the site of a membranous gap, called anterior fontanelle. It ossifies at 18 months of age.
Coronal and sagittal sutures
Frontal bone with the nasal bone
Lambdoid and sagittal sutures
Parietal & Occipital bone