IT Abbreviations
From API to YAML — expand acronyms, say them correctly, use them in context, and know when to spell them out. 4 exercise sets.
Expand the Abbreviation
Match 12 common IT abbreviations to their full forms: API, SSH, ORM, CDN, TLS, and more.
Correct Pronunciation
Know how to say SQL ("sequel"), NGINX ("engine-x"), GIF, IPv6, and other tricky abbreviations aloud.
Usage in Context
Choose the correct abbreviation for the context: REST vs. RPC, CI vs. CD, SLA vs. SLO vs. SLI, and more.
When to Expand
Decide when to write the full form vs. the abbreviation in documentation, code comments, and presentations.
Abbreviation Quick Reference
First use in a document
- "Application Programming Interface (API)" — spell out on first occurrence, abbreviate thereafter
- "Transport Layer Security (TLS) …the TLS certificate…" — parenthetical pattern
Pronunciation traps
- SQL → "sequel" (not "S-Q-L" in most teams)
- NGINX → "engine-x"
- GIF → "jiff" or "gif" — both accepted; know your team
- char → "car" (British) or "care" (American) — common pair
Commonly confused pairs
- CI/CD: Continuous Integration / Continuous Delivery (or Deployment)
- SLA / SLO / SLI: Agreement / Objective / Indicator
- REST / RPC: Representational State Transfer / Remote Procedure Call
- DNS / DHCP: Name resolution / IP address assignment
Frequently Asked Questions
What are the most common IT abbreviations used in daily work?
Everyday IT abbreviations: PR (Pull Request), MR (Merge Request — GitLab), LGTM (Looks Good To Me), WIP (Work In Progress), TBD (To Be Decided), ETA (Estimated Time of Arrival), EOD/EOP/EOW (End of Day/Period/Week), IMO/IMHO (In My Opinion / In My Humble Opinion), FYI (For Your Information), ASAP (As Soon As Possible).
What do EOD, EOP, and EOW mean in IT project communication?
EOD = End of Day (usually 5pm or close of business in the recipient's timezone). EOP = End of Period (sprint end, billing period — context dependent). EOW = End of Week (Friday). These are used in task deadlines: "Can you complete the review by EOD?" Always clarify timezone when working internationally — EOD in Kyiv is not the same as EOD in London.
What abbreviations are common in Slack and async team communication?
Common async abbreviations: TL;DR (Too Long; Didn't Read — summary), FYI (For Your Information — no action needed), FWIW (For What It's Worth), AFAIK (As Far As I Know), IIRC (If I Recall Correctly), AFK (Away From Keyboard), BRB (Be Right Back), NVM (Never Mind), OOO (Out Of Office), WFH (Working From Home).
What does TL;DR mean and how should I use it?
TL;DR means "Too Long; Didn't Read" — it signals a summary for people who can't read the full text. Use it in: (1) long Slack threads to provide a one-line summary at the top; (2) post-incident reports to give a brief overview; (3) documentation that has lengthy context. Format: "TL;DR: The service will be down for 2 hours on Sunday for database migration." Always put the TL;DR at the TOP.
What is the difference between ETA and ETD in IT contexts?
ETA (Estimated Time of Arrival) is used for: "What's the ETA on the fix?" — when will a task be completed? ETD (Estimated Time of Departure/Delivery) is less common in IT but used in deployment planning. In incident response, "ETA for resolution" is the standard phrase. Use ETA when someone is waiting for a deliverable or fix.
What abbreviations are used in code comments?
Code comment abbreviations: TODO (task to complete later), FIXME (known bug to address), HACK or XXX (questionable implementation, needs review), NOTE (important information), OPTIMIZE (performance improvement needed), DEPRECATED (feature being removed). Modern IDEs index TODO/FIXME comments — always include a ticket reference: "TODO(jira-123): remove after migration".
What abbreviations appear in version control and Git workflow?
Git workflow abbreviations: PR (Pull Request), MR (Merge Request), LGTM (review approval), WIP (Work In Progress — draft PR), RFC (Request For Comments — design proposal), CC (Carbon Copy — add reviewer), Nit (minor comment), IIUC (If I Understand Correctly), PTAL (Please Take A Look), AFAICT (As Far As I Can Tell).
How do I use ASAP professionally without sounding demanding?
"ASAP" can sound aggressive when overused. Alternatives: "at your earliest convenience" (very polite), "when you have a moment" (casual), "by [specific time] if possible" (specific and respectful), "this is urgent — can you prioritise?" (honest about urgency). Reserve ASAP for genuine urgency. Using ASAP for everything trains others to ignore it, like the boy who cried wolf.
What abbreviations are used in job postings and recruitment?
Job posting abbreviations: YOE (Years of Experience), IC (Individual Contributor), EM (Engineering Manager), TL (Tech Lead), SWE/SDE (Software Engineer/Developer), SRE (Site Reliability Engineer), PM (Product Manager), TA (Technical Assessment or Talent Acquisition), OTE (On-Target Earnings), RSU (Restricted Stock Units), ESPP (Employee Stock Purchase Plan).
What does 'RFC' mean in IT and how is it different from an engineering RFC?
"RFC" has two meanings: (1) Internet RFC (Request for Comments from IETF) — the formal process for defining internet standards, protocols, and technologies. RFC 2616 defines HTTP/1.1. (2) Engineering RFC — an internal design proposal document where engineers share a proposed change for team feedback. Both use the same acronym but operate at very different scales. Context makes clear which is meant.