IT is full of abbreviations — API, UI/UX, PR, CI/CD, DNS. Most are spelled out letter by letter, but some have developed word-form pronunciations. Knowing which is which marks you as fluent in professional developer English.
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A developer says: "We need to update the API documentation before the release." How is API always pronounced — and what form is never used professionally?
API — "A-P-I" (formal) or "APP-ee" (informal) — never "AH-pee":
API has two accepted pronunciations depending on register:
Important: Neither form is wrong — context determines which fits. The form that does NOT exist in professional English is treating "API" as a non-English abbreviation with a vowel-heavy pronunciation like "AH-pee".
In practice:
"We expose a RESTful AY-PEE-EYE" — formal presentation
"The APP-ee is rate-limited to 100 calls per minute" — team chat
"Check the AY-PEE-EYE docs" — written reference
The letters A, P, I in isolation:
A = /eɪ/ "ay"
P = /piː/ "pee"
I = /aɪ/ "eye"
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A designer says: "The UI/UX team is redesigning the onboarding flow." How are the abbreviations UI and UX said aloud?
UI/UX — "U-I / U-X" — you-eye / you-ex:
Both UI and UX are always spelled out letter by letter:
UI = "U-I" = /juː aɪ/ = "you-eye"
UX = "U-X" = /juː ɛks/ = "you-ex"
Never say "YOO-ee" as one word or "ooh-ee" — these forms don't exist in professional English.
The letter U in abbreviations: The letter U in English is pronounced /juː/ — like the word "you". So any abbreviation with U begins with "you":
URL = "you-arr-ell"
USB = "you-ess-bee"
UX = "you-ex"
UI = "you-eye"
UI/UX in context:
"The UX researcher ran usability tests" — "you-ex researcher"
"Update the UI to match the new brand" — "you-eye"
"The UI/UX team" — "the you-eye / you-ex team"
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A developer asks: "Has anyone reviewed the PR I opened yesterday?" How is PR (pull request) spoken?
PR — "pee-arr" (casual) or "pull request" (formal) — both used:
Form
When it is used
"pee-arr"
Daily standups, team chat: "merge the pee-arr", "leave a comment on the pee-arr"
"pull request"
More formal contexts, onboarding, documentation discussions
The letter P: /piː/ — "pee" — like the word "pea" The letter R: /ɑːr/ — "arr" — like a pirate's "arr" (British: /ɑː/, American: /ɑːr/)
PR in spoken sentences:
"Could you review my PR?" — "pee-arr"
"I opened a PR for the fix" — "pee-arr"
"The pull request is blocked by failing tests" — more formal
Note — PR can also mean "public relations" in non-technical contexts. In developer conversations, "PR" almost always means "pull request" — but be aware of this ambiguity when speaking to mixed audiences.
Related Git abbreviations:
MR (GitLab: merge request) = "em-arr"
CI/CD = "see-eye see-dee"
LGTM = "ell-gee-tee-em" (Looks Good To Me)
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A DevOps engineer mentions the pipeline: "The CI/CD pipeline runs on every push." How are CI and CD said aloud?
CI/CD — "see-eye see-dee" (abbreviation) or full forms (formal):
Both the abbreviation and the full phrase are used in professional contexts: