Geburah
Geburah, Strength

He chose three letters
from among the Elementals
[in the Mystery of the three Mothers
Alef Mem Shin]
And he set them in His great Name
and with them, He sealed six Extremities.
Five: He sealed "above" and faced upward
and sealed it with י ה ו
— Sepher Yetzirah

Geburah is the Destroyer, the Warrior King, the Power of Judgement. It is the response to boundaries: where Chesed wants to push boundaries around, Geburah is reactionary, wanting to keep them where they are.

PlanetMars (Madim, ‎מאדים‏)
NameGeburah, גבורה, strength; also called Din, דינ, judgment
Divine Name Elohim Gibor, אלהים גבור
ArchangelKhamael (חמאל‎)[1], Prince of Strength and Courage
Angelic orderSeraphim, Flaming Ones (also called Order of Powers)
Tarotthe four fives
ColorScarlet red[2]
Yetsiratic Attribution[3] Radical Intelligence (Rooted Consciousness, Sekhel Nishrash), because it is itself the essence equal to the Unity, uniting itself to the Binah or Intelligence which emanates from the primordial depths of Wisdom or Chokmah.
TriadRuach
גבורה is 216, 6 x 6 x 6. Of it, we are told:
Gevurah = 216 = 3 times 72 (chesed). Each of God's 72 hidden Names possesses three letters, in all -- 216 letters.

Geburah is also called Pechad (פחד, Fear).


[1]Sources differ about this name. My best guess is from חמה, sun or heat, thus meaning Sun [or Heat] of God. I have seen one source say "He who sees God".
[2]Colors listed are in the Queen scale. The complete set of colors are:
Orange - King scale (Atziluth)
Scarlet red - Queen scale (Briah)
Bright scarlet - Emperor scale (Yetzirah)
Red flecked with black - Empress scale (Assiah)
[3]From the 32 Paths of Wisdom, often printed as an appendix to Sepher Yetzirah.
[1]Sources differ about this name. My best guess is from חמה, sun or heat, thus meaning Sun [or Heat] of God. I have seen one source say "He who sees God".
[2]Colors listed are in the Queen scale. The complete set of colors are:
Orange - King scale (Atziluth)
Scarlet red - Queen scale (Briah)
Bright scarlet - Emperor scale (Yetzirah)
Red flecked with black - Empress scale (Assiah)
[3]From the 32 Paths of Wisdom, often printed as an appendix to Sepher Yetzirah.