Step 1: Understanding the Concept:
The 12 houses of a horoscope are grouped based on their functional characteristics. Common groupings include Kēndras (1, 4, 7, 10), Trikōṇas (1, 5, 9), and Upacayās (3, 6, 10, 11). Among these, the combination of the 3rd, 6th, and 11th houses has a specific name: 'Triṣaḍāya'. This is a compound word: Tri (\(3^{\text{rd}}\)) + Ṣaḍ (\(6^{\text{th}}\)) + Āya (\(11^{\text{th}}\), the house of income/gain).
Step 2: Detailed Explanation:
The Triṣaḍāya houses are generally considered 'unfavorable' or 'malefic' when it comes to the lordship of planets, though they are excellent for the placement of naturally malefic planets.
1. Characteristics of Triṣaḍāya Lords: In the 'Bhāva-Phala' system, the lords of the 3rd, 6th, and 11th houses are considered 'Papa-Grahas' (malefic influencers) for the specific chart, regardless of their natural nature. For example, if Jupiter rules the 3rd and 6th houses for a Libra ascendant, it is considered a Triṣaḍāyēśa and can cause obstacles.
2. Significance of Individual Houses:
- 3rd (Tri): House of courage, siblings, and short travels. It is the mildest of the three.
- 6th (Ṣaḍ): House of enemies, debts, and diseases (Ari-bhāva).
- 11th (Āya): House of gains and fulfillment of desires. Paradoxically, while the house is 'good' for gains, its lord is considered 'bad' for the overall health and purity of the Lagna.
3. Why they are grouped: These houses represent worldly ambition, competition, and material struggle. They are the 'Upacaya' houses (excluding the 10th) where planets improve their results over time with hard work. However, their lords tend to promote worldly attachment and ego, which is why they are contrasted with the 'Dharma' lords (1, 5, 9).
In predictive astrology, the Dasha of a Triṣaḍāyēśa often brings material success accompanied by health issues or mental stress. Malefic planets (Sun, Mars, Saturn) placed *in* these houses are praised because they give the person the grit to overcome enemies (6th) and achieve high gains (11th).
Step 3: Final Answer:
The 3, 6, 11 houses are collectively called Triṣaḍāya.