| No. | Term | Definition |
|---|---|---|
| 1. | Apartment 4A | Sheldon and Leonard’s home base. |
| 2. | Apartment 4B | Penny’s apartment across the hall. |
| 3. | Astrophysics | Study of stars, galaxies, and space. |
| 4. | Bazinga | Sheldon’s catchphrase after a joke. |
| 5. | Bongo Solo | Howard’s awkward talent showcase moment. |
| 6. | Brawl in the Hall | Fight between Sheldon and Kripke. |
| 7. | Caltech | Workplace of the main scientists. |
| 8. | Cinnamon | Raj’s tiny dog companion. |
| 9. | Comic Center | Store where the gang hangs out. |
| 10. | Comic-Con | Fan convention the group attends. |
| 11. | Darth Vader | Iconic Star Wars villain referenced often. |
| 12. | Degrassi | Show mentioned in pop-culture chats. |
| 13. | Doctor Who | British sci-fi series they love. |
| 14. | Doppler Effect | Physics concept used in a song. |
| 15. | Dungeons & Dragons | Tabletop roleplaying game they play. |
| 16. | Eidetic memory | Sheldon’s near-photographic recall. |
| 17. | Einstein | Physics legend frequently cited. |
| 18. | Emmy | Award the series later won. |
| 19. | Engineering | Howard’s field, mocked by Sheldon. |
| 20. | Excelsior | Stan Lee’s signature exclamation. |
| 21. | Fanboy | Obsessive pop-culture enthusiast. |
| 22. | Feynman | Physicist referenced by the group. |
| 23. | Flash | Superhero often discussed and costumed. |
| 24. | Friendship Agreement | Sheldon’s rules for being friends. |
| 25. | Gag reel | Outtakes and bloopers from filming. |
| 26. | Gothowitz | Howard’s mother’s last name. |
| 27. | Green Lantern | DC hero referenced in debates. |
| 28. | Groot | Guardians character mentioned by fans. |
| 29. | Hawking | Famous scientist Sheldon idolizes. |
| 30. | Higgs boson | Particle central to physics jokes. |
| 31. | Howard Wolowitz | Engineer, astronaut, Bernadette’s husband. |
| 32. | iCarly | Show Sheldon watches with Amy. |
| 33. | Indiana Jones | Adventure hero referenced repeatedly. |
| 34. | Insomnia cookies | Late-night snack run staple. |
| 35. | Joystick | Gaming controller often in scenes. |
| 36. | Jupiter | Planet used in astronomy talk. |
| 37. | Justice League | Superhero team referenced by group. |
| 38. | Kirk | Star Trek captain often compared. |
| 39. | Klingon | Star Trek alien language and culture. |
| 40. | Kripke | Barry, Sheldon’s sarcastic rival. |
| 41. | LARP | Live-action roleplay they try. |
| 42. | Leonard Hofstadter | Experimental physicist, Penny’s husband. |
| 43. | Lightsaber | Star Wars weapon in nerd talk. |
| 44. | Magic: The Gathering | Card game played by the guys. |
| 45. | Marvel | Comics universe they constantly reference. |
| 46. | Mensae | High-IQ club Sheldon mentions. |
| 47. | Mom | Mrs. Wolowitz, unseen but iconic. |
| 48. | Mormon | Religion tied to Amy’s backstory. |
| 49. | Mystic Warlords of Ka’a | Fictional game they obsess over. |
| 50. | Nerdvana | Peak geek happiness moment. |
| 51. | Newton | Scientist referenced in physics banter. |
| 52. | Ninja | Costume and pop-culture staple. |
| 53. | Nobel Prize | Top science award won in finale. |
| 54. | OCD | Sheldon’s compulsive tendencies, joked about. |
| 55. | Officiant | Character who performs a wedding. |
| 56. | Orbit | Path of planets; frequent metaphor. |
| 57. | Pajama party | Amy’s bonding night with the girls. |
| 58. | Penny | Waitress-turned-sales rep, main character. |
| 59. | Physics Bowl | Competition episode with rival team. |
| 60. | Pictionary | Game night that sparks conflict. |
| 61. | Professor Proton | TV scientist idol for Sheldon. |
| 62. | Quantum mechanics | Physics field central to plots. |
| 63. | Quark | Particle often mentioned in dialogue. |
| 64. | Raj Koothrappali | Astrophysicist with selective mutism. |
| 65. | Red Sweater | Sheldon’s signature clothing style. |
| 66. | Rock-Paper-Scissors-Lizard-Spock | Expanded game to resolve disputes. |
| 67. | Roommate Agreement | Sheldon’s contract for living rules. |
| 68. | Schrödinger | Cat paradox often referenced. |
| 69. | Sheldon Cooper | Brilliant, rigid theoretical physicist. |
| 70. | Shiny Trinket Maneuver | How Sheldon distracts Penny. |
| 71. | Soft kitty | Lullaby sung when someone’s sick. |
| 72. | Spock | Star Trek icon and logic model. |
| 73. | Star Trek | Franchise core to many jokes. |
| 74. | Star Wars | Space saga referenced constantly. |
| 75. | String theory | Sheldon’s specialty, debated often. |
| 76. | Super Asymmetry | Sheldon and Amy’s Nobel work. |
| 77. | TARDIS | Doctor Who time machine prop. |
| 78. | The Cheesecake Factory | Penny’s original workplace. |
| 79. | The Flash | Hero central to cosplay episodes. |
| 80. | The Hulk | Marvel character referenced in banter. |
| 81. | Thor | Marvel hero used in comparisons. |
| 82. | Time machine | Prop built for a prank. |
| 83. | Tissue | Sheldon’s gift-wrapping protocol item. |
| 84. | Trains | Sheldon’s lifelong obsession and hobby. |
| 85. | Uber | Ride service used in later seasons. |
| 86. | Unicorn | Mythical creature in nerd humor. |
| 87. | Urkel | Sitcom nerd referenced as comparison. |
| 88. | Vulcan | Spock’s species; logic ideal. |
| 89. | Vulcan salute | Spock’s hand gesture used by fans. |
| 90. | Wheaton | Wil, recurring nemesis-turned-friend. |
| 91. | Whiteboard | Where equations and plans appear. |
| 92. | Wookiee | Star Wars species like Chewbacca. |
| 93. | X-ray crystallography | Science method mentioned in passing. |
| 94. | Xbox | Console used for gaming sessions. |
| 95. | XKCD | Geek webcomic referenced by fans. |
| 96. | Yeti | Cryptid referenced in geek talk. |
| 97. | Yoda | Star Wars mentor quoted often. |
| 98. | You’re in my spot | Sheldon’s claim to his seat. |
| 99. | Zack Johnson | Penny’s sweet but dim ex. |
| 100. | Zazzles | Sheldon’s cat experiment name. |