ChaGaT
The name ChaGaT refers to three intellectual Sefirot (Divine Emanations) which comes from 10 Sefirot which form the Tree of Life.
Cha - (04. Chesed (Mercy; חסד) Ga - (05. Gevurah (Severity; גבורה) T - 06. Tiphareth (Redeemer; תיפארת)
The 10 names of the Sephirot are:
01. Kether (Crown; כתר) 02. Chochmah (Wisdom; חכמה) 03. Binah (Understanding; בינה) 04. Chesed (Mercy; חסד) 05. Gevurah (Severity; גבורה) 06. Tiphareth (Redeemer; תיפארת) 07. Netzach (Victory; נצח) 08. Hod (Majesty; הוד) 09. Yesod (Foundation; יסוד) 10. Malkhuth (Kingdom; מלכות)
Occasionally another is enumerated: Da'at (Knowledge; דעת)