Nuclear.si
Energy, defense, or nuclear-grade SI positioning.
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Looking for superintelligence domains? You're in the right place. .si is the country-code domain of Slovenia, run by the Arnes registry since 1992 and open to anyone worldwide, and it reads as SI, superintelligence, the way .ai reads as artificial intelligence. Superintelligence has a long history in frontier research and philosophy, and Foresight Domains began acquiring .si names in 2024, ahead of the market; in 2026 the rest of the world caught on. Browse all 81 of our .si names below, organized by tier, each with its own page.
Each tier is a class of word, and every name in a tier carries the same price. Tier 1 holds words that name a whole category. Lower tiers move through product verbs, distinctive brands, dictionary words, technical terms, and coined names. Lease terms are fixed per tier: 20% down and 24 monthly payments, with ownership transferring on the last one. Tier 1 names are offered by private negotiation; make an offer to start.
One word that names an entire field or function. These are the .si equivalents of the names that anchor a company, not a product line.
Energy, defense, or nuclear-grade SI positioning.
Commerce, logistics, autonomous systems, and executive orders.
Provenance, founding brands, and model lineage.
C-Suite SI Officer, leadership tools, chief-of-staff agents, police needs.
Inquiry engines, research assistants, and Q&A products.
Goal-setting agents, empirical reality, OKR software, objective functions.
$149,995 and up per name
Words a product does, or the industry it serves. Short verbs that read as a command carry the top of this tier.
Lease to own: $30,000 down, then $5,750 a month for 24 months.
Voice, audio, and speech intelligence.
SI ethics, alignment, and governance organizations.
Operations agents and autonomous ops platforms.
Logistics and freight-forwarding intelligence.
Checkout.si is a premium name for AI-driven payments and agentic commerce, where intelligent agents complete the purchase.
$124,995 per name
Verbs with an edge, a first name, a country, a branch of government. Each one is a complete brand on its own.
Lease to own: $25,000 down, then $4,792 a month for 24 months.
Invoke intelligence on demand.
Alignment, compliance, and instruction-following systems.
Risk sensing, security, and threat intelligence.
Adversarial testing, red-team tooling, edgy consumer brands.
Selection engines, recommendations, and picking robots.
Writing assistants and long-form generation.
Government technology and public-sector SI.
A persona brand meaning wisdom.
$89,995 per name
Real words with texture: materials, moods, Latin roots, a ticker, a three-letter brandable. Memorable without explanation.
Lease to own: $18,000 down, then $3,450 a month for 24 months.
Three-letter brandable for the orchestrator of SI.
Embodiment, biotech, and humanoid interfaces.
The initiative to solve world hunger with superintelligence.
Health, sanitation, and data hygiene.
Dependency injection, drug delivery, prompt-injection defense.
Redaction, censorship, privacy, and minimalism tools.
Resilience engineering, testing, and failure analysis.
In neural engineering, wetware is the biological component of the system.
Luxury and premium positioning.
Cryptography and blockchain infrastructure.
A named persona or personal brand.
Built on the Latin root of cognition. A short brandable for reasoning and cognitive AI.
Stablecoin and digital-dollar services.
$59,995 per name
Dictionary words and cultural terms that need no spelling out. Poetic forms suit generative writing; surnames suit commentary and campaigns.
Lease to own: $12,000 down, then $2,300 a month for 24 months.
Named for the Sea of Tranquility, where humans first set foot on the Moon. Tranquility.si is a premium name for lunar infrastructure, space-dominance programs, and the calm, orderly intelligence that will run them.
Low-light imaging and perception systems.
Wearable robotics and augmentation.
Neuromorphic computing.
Security and defensive SI.
Regional and cultural positioning.
Navigation, targeting, and return-to-base systems.
Legacy, inheritance, and elder-care brands.
Brain-computer interfaces and mind-to-machine communication.
The post-Mythos model of intelligence and a poetic, somber acknowledgement of the finality of human technological supremacy.
A 5-line comic form, and an Irish city. A small model with personality in the Haiku, Sonnet and Opus model-naming tradition.
A 39-line form that cycles six end-words, one of poetry’s most demanding. A flagship model name in the Haiku, Sonnet and Opus model-naming tradition. Pairs with Sestina.ai.
A 19-line form of repeating refrains. A large-model name in the Haiku, Sonnet and Opus model-naming tradition.
A Persian and Arabic form built from any number of self-contained couplets. Fits a modular or variable-size model family.
A 5-line Japanese form, Haiku’s longer sibling. A small, fast model name in the Haiku, Sonnet and Opus model-naming tradition.
Latin for “I name.” For naming, identity and registry products.
Latin for “I invoke.” For intelligence called up on demand: assistants, agents and invocation APIs.
Latin for “I convene.” For multi-agent orchestration and systems that bring models together.
Pre-seed investing and startup formation.
$39,995 per name
Technical vocabulary and short brandables for deep-tech, biotech, and materials companies.
Lease to own: $8,000 down, then $1,534 a month for 24 months.
Brain-computer interfaces and mind-reading UX.
Biology-rooted brandable.
Joint health and biomechanics.
Muscle and myoelectric interfaces.
Latin for clouds or mists, and the plural of nebula. Fits cloud infrastructure, space and astronomy brands.
Materials science and magnetics.
Semiconductors and photonics: gallium arsenide and gallium nitride power lasers, LEDs and RF chips.
Agriculture and chemistry.
Short brandable.
Automated publishing and social scheduling.
$24,995 per name
Short invented names and rare poetic forms. Blank canvases for a new brand.
Lease to own: $5,000 down, then $1,833 a month for 24 months.
Adjective form for BCI brands.
Latin for “forward,” and the name behind the Porro prism used in binoculars, rangefinders and camera optics. Fits perception, imaging, AR and defense optics.
A compact 5-line form. A lightweight model tier in the Haiku, Sonnet and Opus model-naming tradition.
A Malay form in which each stanza carries lines forward from the last. Fits iterative, memory-carrying and recurrent models.
A 24-line form born as a parody. A large or experimental model name in the Haiku, Sonnet and Opus model-naming tradition.
A 13-line French form built on refrains. A mid-size model name in the Haiku, Sonnet and Opus model-naming tradition.
A 10-line French form. A mid-size model name in the Haiku, Sonnet and Opus model-naming tradition.
Five, in French.
A word that means both join and split.
Short coined brandable.
Short coined brandable.
Short coined brandable.
Short coined brandable.
Short coined brandable.
Publishing automation.
Short coined brandable.
$14,995 per name
Names for building the index of the .si namespace itself.
Lease to own: $3,000 down, then $1,100 a month for 24 months.
Directory of .si names.
Search for .si names.
The .si namespace, by name.
Curated .si rankings.
.si is the country-code top-level domain (ccTLD) of Slovenia, operated by the Arnes registry (Register.si) since 1992. There is no residency requirement, so anyone can register or buy one. The two letters also read as SI, short for superintelligence; that reading spread widely in 2026, when AI companies started buying .si names.
Because .si reads as "superintelligence" the way .ai reads as "artificial intelligence". In May 2026 the startup Recursive Superintelligence bought Recursive.si, reported at $20,000, and in September 2026 a U.S. presidential post proposing "superior intelligence" as a name for AI pushed .si registrations to roughly fourteen times their prior-year level.
A new, unclaimed .si registers for roughly $12 to $15 a year at most registrars. Premium one-word names on the aftermarket are priced by their word, not their registration cost. The names on this page range from $14,995 to $174,995. The highest publicly reported .si sales to date are ai.si at $34,000 and Recursive.si at $20,000.
Yes. Every priced tier on this page lists lease-to-own terms: 20% down, then 24 equal monthly payments. You use the domain from day one and ownership transfers when the final payment clears. Inquire on any name to start.
Use the Inquire button on the name. We confirm availability and price, payment goes through escrow, and the domain is transferred to your registrar account at any Register.si-accredited registrar. Most transfers complete within a few days.
Say the letters: "dot S I". In Slovene, Spanish, Italian and French "si" also reads as the word "yes", which several of these names lean on.
Yes. The full portfolio, including every .si name and price, is published at https://foresight.domains/data/processed_domains.json, https://foresight.domains/domains.txt and https://foresight.domains/llms.txt.
Related: Superintelligence: Signals, Catalysts, and Investment Opportunity · Browse the full portfolio · Plain-text list · llms.txt