72 characters, locations, and items in this world codex.

Characters

Ai AA — Astronomer, businesswoman, and the closest thing Cheng Xin has to a sister — discovered the habitable planets of DX3906, ran the StarRing Group for he
Bill Hines — Nobel-nominated British neuroscientist and Third Wallfacer — the husband-and-wife team's quieter half, whose public plan was to enhance human cognitio
Chang Weisi — PLA general, China's senior delegate to the Planetary Defense Council, the man who recruits Wang Miao into the Battle Command Center in the trilogy's
Cheng Xin — Aerospace engineer, the woman who could not pull the trigger and so lost the Earth — twice. Swordholder for six minutes, custodian of Yun Tianming's l
Chu Yan — Captain of the warship Blue Space — the only one of the Starship Earth captains who guessed the trap in time, ran his ship in vacuum during the Battle
Ding Yi — Theoretical physicist, Yang Dong's lover, the man who plays pool with Wang Miao while explaining the death of physics, and who later climbs aboard a f
Dongfang Yanxu — Captain of the warship Natural Selection — the elegant Solar Fleet officer cleared of Escapist suspicion, then hijacked by Zhang Beihai mid-mission an
Fraisse — An elderly Australian Aboriginal man, pulled out of hibernation centuries after his death-bed wish, who befriends Cheng Xin and AA in the death-camp A
Frederick Tyler — Former US Secretary of Defense and the First Wallfacer — the strategist whose public plan was a kamikaze drone swarm and whose secret plan was to defe
Guan Yifan — Astrophysicist aboard a deep-space scout ship, the man Cheng Xin and AA meet at DX3906 — the cosmologist who first spells out, to the only humans left
Keiko Yamasuki — Japanese neuroscientist, wife and lifelong research partner of Bill Hines — co-author of the quantum brain-activity work that made the Wallfacer menta
Lei Zhicheng — Political commissar of Red Coast Base — the ideologically vigilant bureaucrat who kept the antenna pointed at the right targets, denied Ye Wenjie perm
Luo Ji — The slacker astronomer who became humanity's third Wallfacer, deduced the Dark Forest theory in a graveyard, held a gun to two civilizations' heads fo
Manuel Rey Diaz — Former President of Venezuela and the Second Wallfacer — the strongman whose stated plan was a stellar-yield hydrogen bomb and whose secret plan was t
Mike Evans — Oil-fortune heir turned anti-human environmentalist turned founder of the Adventist faction of the ETO — the man who funded humanity's betrayal of its
Pan Han — Famous biologist and founder of the Pastoral China community, Adventist enforcer inside the ETO — the public-intellectual environmentalist who persona
Princeps — Supreme leader of Trisolaran Civilization Number 200 — the consul-king who authorized the launch of the colonization fleet, the construction of sophon
Saul Durand — A failed graduate student turned wandering writer who is named the Fourth Wallfacer for reasons no one will explain — a man chosen, it turns out, beca
Shao Lin — Ye Wenjie's mother — the physicist who saved herself in the Cultural Revolution by denouncing her husband, and who lived afterward in the small comfor
Shen Yufei — Japanese-Chinese applied physicist, wife of Wei Cheng, a Redemptionist member of the ETO — the woman who pulled Wang Miao into the Three Body game and
Shi Qiang — Beijing detective, ex-counter-terrorism, the only character who survives meaningfully across all three books — first as Wang Miao's bodyguard, then as
Sophon — The Trisolaran ambassador on Earth — a robotic body shaped like a porcelain Japanese tea-ceremony hostess, controlled by a sentient proton-sized super
Tatiana Haas — Adventist agent raised from birth inside Mike Evans' organization — the assassin protected by the sophons themselves, who escapes a police raid mid-bu
Thomas Wade — Chief of the PDC's Strategic Intelligence Agency, the sociopath who pushed through the Staircase Program, lost the Swordholder vote to Cheng Xin, then
Vera Ye — Ye Wenjie's granddaughter and Mike Evans' biological daughter — a particle physicist at the Diamond Light Source whose childhood mentorship of Saul Du
Wang Miao — A nanomaterials researcher who answers a phone call from a chain-smoking detective and is dragged inside the strangest scientific conspiracy in human
Wei Cheng — Reclusive mathematician, husband of Shen Yufei — the unkempt genius who quietly solved a tractable approximation of the three-body problem in his livi
Yang Dong — Daughter of Ye Wenjie, brilliant superstring physicist, lover of Ding Yi — the woman who killed herself when she realized that physics had never exist
Yang Weining — Chief engineer of Red Coast Base, husband of Ye Wenjie, posthumous father of Yang Dong — the man who pulled Ye out of a Khingan logging camp and offer
Ye Wenjie — The astrophysicist who watched her father beaten to death by Red Guards, then answered the universe's first reply to humanity with 'Come here. I will
Ye Zhetai — Theoretical physicist at Tsinghua, Ye Wenjie's father — the man whose death by Red Guards' belt-buckles in front of his daughter is the original wound
Yun Tianming — The terminally ill engineer who bought a star for the woman he loved without telling her, then volunteered his own brain for the Staircase Program. Ca
Zhang Beihai — PLA Navy political commissar, secret Escapist, and the man who hijacked the warship Natural Selection to flee the Solar System rather than die in the

Locations

4th Dimension — A collapsing bubble of higher-dimensional space encountered by Blue Space and Gravity en route to NH558J2 — a place where every 3D object opens like a
Beijing — China's capital — Wang Miao's nano lab, Da Shi's police station, Chang Weisi's PLA briefing room, Tsinghua University, the apartments of the Frontiers
Blue Space — A 1,500-meter Stellar-class warship of the Asian Fleet — the only vessel to survive the Battle of Darkness with crew intact, then to enter and return
Bunker World — The string of O'Neill-cylinder space cities humanity built in the gravitational shadows of Jupiter and Saturn during the Bunker Era — humanity's last
China — The People's Republic of China — birthplace of the Trisolaran crisis. Where Red Coast hid in the mountains, where the Cultural Revolution killed Ye Zh
DX3906 — The unremarkable nearby star Yun Tianming bought for Cheng Xin out of his cancer money — later confirmed by AA's gravitational-lensing work to host tw
Earth — Humanity's home — a stable single-star world the Trisolarans coveted for four hundred years, surveilled by sophons for the same span, force-resettled
Greater Khingan Mountains — The cold fir-and-larch range of Inner Mongolia and Heilongjiang where Red Coast Base hides at Radar Peak — the place Ye Wenjie was first exiled to, an
Judgment Day — Mike Evans' converted oil tanker — the floating headquarters of the Adventist faction of the ETO, sailing the Pacific with a hold full of Trisolaran t
Milky Way — The barred-spiral galaxy that contains both the Solar System and Trisolaris — and, somewhere unseen in its depths, the Singer who throws photoids and
Nanotechnology Research Center — Wang Miao's lab — a high-security materials facility in Beijing where the Sinotron II particle accelerator was meant to deliver the next decade of Chi
Natural Selection — The Stellar-class warship Zhang Beihai hijacked from Captain Dongfang Yanxu in the opening hours of the Doomsday Battle — humanity's first true escape
New York City — The American megacity that hosts the United Nations and, by extension, the global political center of the Crisis Era — Saul Durand walks its avenues,
Red Coast Base — A top-secret radio observatory disguised as a missile-defense test on Radar Peak in the Greater Khingan Mountains — the antenna from which Ye Wenjie s
Solar System — The eight-planet star system around the Sun — the stage for the Doomsday Battle between Jupiter and Saturn, the Bunker Era retreat behind the gas gian
Trisolaris — The single planet of the Alpha Centauri three-body system — homeworld of the Trisolarans, hurled from sun to sun by chaotic gravity, destroyed in the
Tsinghua University — Beijing's premier scientific university — the campus where Ye Zhetai was beaten to death in a struggle session, where Ye Wenjie taught physics for two
United Nations Headquarters — The New York campus on the East River where the Planetary Defense Council was constituted, the Wallfacer Act was passed, and humanity's collective res
Ye Wenjie's Lakeside House — A small wooden house on a flat reedy lake outside a Chinese provincial city — the retired Tsinghua professor's chosen final home, where Ye Wenjie meet
Zhaoge (Trisolaris) — The political capital of Trisolaran Civilization Number 200 — the city where the Princeps holds court, the sophon program is authorized, and the decis

Items

Curvature Propulsion — Lightspeed drive that warps the geometry of spacetime in front of a vessel — the engine first hinted at in Yun Tianming's fairy tales, built in secret
Droplets — Mirror-perfect quicksilver teardrops, three meters long, hulls of strong-interaction material almost impossible to damage — the unmanned Trisolaran pr
Dual-Vector Foil — A small, paper-thin slip — the size of a credit card, white as a business card — which when activated collapses three-dimensional space into two dimen
Earth-Trisolaris Organization — The worldwide fifth-column conspiracy founded by Ye Wenjie and funded by Mike Evans — humanity's voluntary auxiliary to the Trisolaran invasion, split
Frontiers of Science — An international academic society — outwardly a respected science forum, secretly a recruitment apparatus of the ETO that targeted physicists and math
Gravitational Wave Broadcast System — A worldwide network of long-baseline gravitational-wave antennae — the trigger of the Dark Forest broadcast that would expose both Earth and Trisolari
Halo Group — A private aerospace and lightspeed-engine corporation founded around Cheng Xin's DX3906 stellar deed, run after her hibernation by AA, then taken over
PDC Strategic Intelligence Agency — The PDC's intelligence and special-operations arm under Thomas Wade — the agency that ran the Staircase Program, vetted Swordholder candidates, and op
Planetary Defense Council — The UN body chartered in Year 1 of the Crisis Era to coordinate humanity's defense against the Trisolaran invasion — sponsor of the Wallfacer Act, par
Solar Fleet — Earth's space navy of the Crisis Era — the fusion-driven Stellar-class warship force assembled across two centuries to meet the Trisolaran invasion, a
Sophons (Protons) — Sentient supercomputers fashioned by Trisolaran engineers from single protons unfolded across multiple dimensions and refolded — sent to Earth at ligh
Staircase Capsule — A nuclear-pulse-accelerated lightsail probe — the first object humanity ever sent to intercept the Trisolaran fleet — carrying, in a frozen biopreserv
Staircase Program — Wade's classified initiative to send a single human envoy to the Trisolaran fleet — a nuclear-pulse-accelerated lightsail probe carrying a frozen brai
The Dark Forest Theory — Cosmic sociology's central proof — that the universe is a forest in which every civilization is an armed hunter, and that any civilization which revea
Three Body (Game) — An immersive VR simulation built by the ETO to teach the history of Trisolaris through analogues of human civilizations — the recruiting tool that pul
Trisolaran Fleet — The colonization armada — 1,000-plus warships at sub-relativistic acceleration, four hundred years from Earth at launch — that the Trisolarans dispatc
Trisolarans — The native sentient species of Trisolaris — a civilization of beings who think in transparent visual flashes, cannot lie, can dehydrate themselves int
Wallfacer Project — A UN-chartered defense protocol exploiting the one thing the sophons cannot read — human thought. Four individuals were given near-unlimited resources
Yun Tianming's Fairy Tales — Three children's stories — about a princess, a soap-bubble umbrella, and a hungry king — composed by Yun Tianming under Sophon's surveillance and tran

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