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BUG Insect ▸ Software bug MOUSE Mouse (animal) ▸ Computer mouse TOKEN Token (coin) ▸ Token (language model)BIAS Bias (prejudice) ▸ Bias (machine learning)TRANSFORMER Electrical transformer ▸ Transformer (deep learning)AGENT Agent (person) ▸ AI agent GROUNDING Grounding (punishment or electrical) ▸ Grounding (AI)EPOCH Epoch (era) ▸ Epoch (machine learning)INFERENCE Inference (logic) ▸ Inference (AI)DAEMON Daemon (mythology) ▸ Daemon (computing)MEMORY Memory (mind) ▸ Computer memory CACHE Cache (hidden store) ▸ Cache (computing)VIRUS Virus (biology) ▸ Computer virus PATCH Patch (fabric) ▸ Patch (computing)PING Ping (sound or sonar) ▸ Ping (networking)BRANCH Branch (tree) ▸ Branch (version control)PUSH Push (physical) ▸ Push (version control)SOCKET Socket (outlet or anatomy) ▸ Network socket TERMINAL Terminal (transport) ▸ Computer terminal KEY Key (lock) ▸ Key (cryptography)SEED Seed (botany) ▸ Random seed CLIENT Client (customer) ▸ Client (computing)FARM Farm ▸ Server farm TROLL Troll (folklore) ▸ Internet troll PHISH Fishing ▸ Phishing CRAWL Crawl (movement) ▸ Web crawl NET Net (mesh) ▸ The Net (internet)FOOTPRINT Footprint ▸ Memory footprint LEAK Leak (fluid) ▸ Memory leak EXCEPTION Exception (special case) ▸ Exception (programming)TREE Tree ▸ Tree (data structure)FEED Feed (animal) ▸ News feed HANDLE Handle (grip) ▸ Handle (username)ZOMBIE Zombie (folklore) ▸ Zombie (computing)CANARY Canary (bird) ▸ Canary release CLASS Class (school or society) ▸ Class (programming)CORE Core (center) ▸ Core (CPU)DECAY Decay (rot) ▸ Weight decay DOCK Dock (maritime) ▸ Dock (macOS)DRAWER Drawer (furniture) ▸ Navigation drawer BUG Insect ▸ Software bug MOUSE Mouse (animal) ▸ Computer mouse TOKEN Token (coin) ▸ Token (language model)BIAS Bias (prejudice) ▸ Bias (machine learning)TRANSFORMER Electrical transformer ▸ Transformer (deep learning)AGENT Agent (person) ▸ AI agent GROUNDING Grounding (punishment or electrical) ▸ Grounding (AI)EPOCH Epoch (era) ▸ Epoch (machine learning)INFERENCE Inference (logic) ▸ Inference (AI)DAEMON Daemon (mythology) ▸ Daemon (computing)MEMORY Memory (mind) ▸ Computer memory CACHE Cache (hidden store) ▸ Cache (computing)VIRUS Virus (biology) ▸ Computer virus PATCH Patch (fabric) ▸ Patch (computing)PING Ping (sound or sonar) ▸ Ping (networking)BRANCH Branch (tree) ▸ Branch (version control)PUSH Push (physical) ▸ Push (version control)SOCKET Socket (outlet or anatomy) ▸ Network socket TERMINAL Terminal (transport) ▸ Computer terminal KEY Key (lock) ▸ Key (cryptography)SEED Seed (botany) ▸ Random seed CLIENT Client (customer) ▸ Client (computing)FARM Farm ▸ Server farm TROLL Troll (folklore) ▸ Internet troll PHISH Fishing ▸ Phishing CRAWL Crawl (movement) ▸ Web crawl NET Net (mesh) ▸ The Net (internet)FOOTPRINT Footprint ▸ Memory footprint LEAK Leak (fluid) ▸ Memory leak EXCEPTION Exception (special case) ▸ Exception (programming)TREE Tree ▸ Tree (data structure)FEED Feed (animal) ▸ News feed HANDLE Handle (grip) ▸ Handle (username)ZOMBIE Zombie (folklore) ▸ Zombie (computing)CANARY Canary (bird) ▸ Canary release CLASS Class (school or society) ▸ Class (programming)CORE Core (center) ▸ Core (CPU)DECAY Decay (rot) ▸ Weight decay DOCK Dock (maritime) ▸ Dock (macOS)DRAWER Drawer (furniture) ▸ Navigation drawer

Original · left

Flag semaphore

First in use: the 1790s

Duplicate · right

Semaphore (programming)

First in use: c. 1962

Semaphore / Flag semaphore / Semaphore (programming)

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Canonical todayMeasuring…

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Duplicate share · 12 mo—

Last crossover—

Colour keyGrey · original meaningGreen · duplicate meaningAmber · contested (40–60%)How colours work

Signal flags vs. Dijkstra's lock.

Which meaning of Semaphore is the original, and which one is the duplicate riding on its name? Flag semaphore came first (the 1790s). Semaphore (programming) arrived in 1962. The data below shows which one owns the word now.

Wikipedia pageviews since 2015

Flag semaphoreSemaphore (programming)

English Wikipedia pageviews since July 2015 load here.

Duplicate's share of attention

Green line = duplicate's % · above 60 it owns the word · below 40 the original does

The case for each meaning

Sourced definitions, usage stats and quotes

Original · the 1790s

Flag semaphore

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Duplicate · c. 1962

Semaphore (programming)

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More duplicated terms

Programming & software

Bug · Software bug Cookie · HTTP cookie Architecture · Software architecture Thread · Thread (computing)Fork · Fork (software)Daemon · Daemon (computing)Container · Container (software)Sandbox · Sandbox (computing)Stack · Stack (computing)Queue · Queue (data structure)Patch · Patch (computing)Crash · Crash (computing)Root · Root (computing)Branch · Branch (version control)Trunk · Trunk (version control)Commit · Commit (version control)Push · Push (version control)Pull · Pull (version control)