Embattled or Crenel: The "Embattled" cross, also known as the Raguly Cross or Ragged Cross. The Embattled Cross is a variation of the Crenel Cross, or Ragulee cross, is a heraldic cross that symbolizes strength.
Engrailed: The "Engrailed" cross, or Sinclair Engrailed Cross, is indented with curved concave notches. The notches alude to the Holy Grail, or the Bloodline of the Holy Grail. Sinclair refers to the guardians of the Holy Grail.
Earth Square: The "Earth Square" cross, Christianized. Undoubtedly refers to the four corners of the Earth.