The short answer
Workable rather than favoured, and genuinely good in the few trades that sell expertise.
Ketu rules 7, and practitioners rate it workable as a name digit — below 5, 6, 1, 3 and 9, above 2, 4 and 8. Where it earns is depth: art, antiques and clinics carry a 7 unit well, and technology names it among its favoured digits. A 7 business is chosen because the buyer trusts the judgement inside it.
The blocks are specific and absolute. The sector table refuses 7 in construction and in legal practice. Seven with 2 is a refused founder pair, and 7 with 8 is contested — some practitioners allow it, others refuse it, and the site shows both rather than settling it. Ketu also pays late, like Rahu: a 7 founder funds a flat stretch before the return arrives. So avoid 7 on a contracting or a law firm, and instead take it where the customer is buying an opinion.
What does 7 carry?
Ketu rules 7 in the Navagraha, the south node and the other half of Rahu, and Chaldean numerology reads the number as depth without display: research, analysis, the long project, the foreign market, because Ketu's nature is to look inward and far away. A founder born on the 7th, 16th or 25th goes deep. Ketu has no weekday of its own; Sunday and Thursday are its favourable days in the practitioner table and Saturday its fasting day. Green and yellow are its colours and black the one to keep off the brand, since black belongs to Saturn; practitioners are split on the colours for 7, and both readings are stated. In the friendship table 7 befriends 1, 5 and 6, reads every other number as neutral, and is opposed to nothing, which makes it the second number after 5 with no adversary. The classical table reads 16, the Tower, as mixed and strong only for jewellery and luxury; 25 reads mixed, 34 neutral, and 43 as one to avoid.
Where does 7 earn?
A 7 business goes deep. Software products, education, consulting, healthcare and logistics all rate 7 second, and technology and trading rate it strong, because product companies, research, analysis and trades that cross borders reward Ketu's patience. Growth is slow and durable, and the exposure is the partner: a 7 reads everyone as neutral and so does not see the 8 or the 9 coming, since a number with no adversaries has no early warning. Construction, manufacturing and legal advise against a 7, because each needs a visible hand on the site or in the court, and Ketu works out of sight. The roles that suit a 7 are finance, records, research, planning and people. The fixes follow. Take a 1 or a 5 partner who faces the customer; both are friends of 7. Launch in a personal year of 1, 5 or 6, the window in which a 7 founder's dates score highest. Put the company name on a 5 or a 6 rather than on the 7 compounds, and keep the founder's depth on the product. The sector ranking below is computed at render time. This part is worked out by the calculators: open the calculator.
How does 7 lose, and what is the path?
A partner chosen because nothing reads as opposed, a launch outside the 1, 5 and 6 window, and a 7 name in a trade that needs a face on the floor are the ways a 7 loses, because each mistakes Ketu's neutrality for safety or asks it to be seen. Each has a path. Run the partner check before the agreement rather than after. Let the calendar choose the year. Put the founder's depth on the product while a 5 carries the name and the counter. Keep practices on Saturday, green and yellow rather than black on the brand, and the 1, 5 and 6 friends as the faces of the business.
Which numbers work with 7?
This part is worked out by the calculators: open the calculator.
Which compounds reduce to 7?
This part is worked out by the calculators: open the calculator.
A worked example
This part is worked out by the calculators: open the calculator.
Frequently asked questions
Is 7 good for a business name?
Workable rather than favoured, and genuinely good in the few trades that sell expertise.
Is 7 good as a founder number?
A founder number is not chosen, it is given by the date of birth. What it decides is which name digits are open to you — run Name Score with your date and the calculator reads both directions.
Where do these readings come from?
The classical Chaldean text for the letter values and the compounds, the Navagraha for the planets, and the practitioner tradition for the friendship and sector tables; the profile prose was reviewed against those sources.