In Game
Master: You
Senpai: Used to refer to a senior member of an organization. In this context, it refers to you.
Servant: Units that you summon from battle, usually spirits based from myth and legends.
Noble Phantasm (NP): Special moves Servants can use when their NP gauge are fully charged.
Spirit Origin: Cards
Craft Essence (CE): Servant Equipment
Mystic Code: Master Equipment
Chaldea Gate: Mission Hub
Singularity: Story Chapter
Holy Grail: Story MacGuffin. Also a very limited resource for raising Servant level cap.
Spirit Origin: List of all seen and acquired Servants
Saint Quartz: Currency used for summoning 3* to 5* cards.
Friend Points: Currency used for summoning 1* to 3* cards.
Mana Prism: Shop Currency
Burning: Selling cards for mana prisms.
QP: Common currency used in leveling and upgrading Servants and Servant skills.
Ascension: Upgrading a Servant; increase level cap and unlocks new skills/portraits/dialogues.
Palingenesis: Upgrading a Servant with a Holy Grail; Also increases max level cap.
Ember/Fire/Blaze of Wisdom: Experience cards used to level up Servants.
Fandom
Waifu / Husbando: Favorite Servant (Female/Male)
Gems: Saint Quartz
Apologems: Free Quartz for when the servers are down.
Gacha: Summoning screen (Luck-based/ lottery system used for summoning)
Rolling: Summoning
10 Roll: A 30 Quartz roll that gives slightly better odds.
YOLO roll: a single Quartz or Ticket roll
Memeroll: a single Quartz or Ticket roll
Banner: Limited time special summoning opportunity with increased rate for featured Servants and CE.
Rate Up: Do not trust their lies.
Salt: Complaints
F2P: Free to play players
Whale: Players that pay for the server upkeep.
Reroll: Resetting the game by deleting game data (or reinstalling the game) for a chance at better Servants with the initial summons.
Leyline: Dragon Meridian CE
Nicknames
See this topic by /u/FileLoop for nickname origins.
Archer: EMIYA
Artemis Orion
Artoria: Altria Pendragon
Banana: Ibaraki-Douji
Cat: Tamamo Cat
Cockroach: Cu Chulainn
COOL: Gilles de Rais
Dog: Cu Chulainn
Eggplant: Mash Kyrielight
Gudako: Female Protagonist
Gudao: Male Protagonist
Herc: Heracles
Iri: Irisviel (Dress of Heaven)
Iskandar: Both Iskandar and Alexander
JAlter: Jeanne d'Arc (Alter)
Jannu: Jeanne D'Arc
Kiritsugu: EMIYA (Assassin)
KIRA KIRA: Marie Antoinette
Kiyokiyo: Kiyohime
Ko-Gil Kid Gilgamesh
Mama: Minamoto-no-Raikou or EMIYA
Moedred: Mordred
Nobu: Oda Nobunaga
REGEND: Sasaki Kojiro
ROMA: Romulus
Saber: Altria Pendragon
SAlter: Altria Pendragon (Alter)
Savior of France: Sasaki Kojiro
Shishou: Scathach
STELLA: Arash
Sumanai: Siegfried
Umu: Nero Claudius
Waver: Zhuge Liang
Acronyms
| * | Description | 
|---|---|
| A | Arts Card | 
| AoE | Area-of-effect Damage | 
| AP | Action Points; Stamina | 
| B | Buster Card | 
| CE | Craft Essence; Equipment | 
| CAH | Cursed Arm Hassan | 
| CN | Chinese/Taiwanese Server | 
| DW | Delightful Work; Game Developer | 
| EX | Extra Card | 
| F2P | Free to Play Players | 
| FP | Friends Points; For Summoning | 
| JP | Japanese Server | 
| MLB | Max Limit Break; Combining 5 CEs for upgrades to effect | 
| MP | Mana Prism; Shop Currency | 
| MXH/MHX | Mysterious Heroine X | 
| NA | North American Server | 
| NP | Noble Phantasm; Special Move | 
| NP# | Noble Phantasm levels by combining duplicate Servant cards | 
| P2W | Paid-to-Waifu players | 
| Q | Quick Card | 
| QP | Quantum Piece; general currency | 
| SQ | Saint Quartz; paid summoning currency. | 
| ST | Single Target Damage | 
| TM | Type Moon; Franchise Creator | 
