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100 Abbreviations Every High School Student Should Know

January 27, 2026

No. Term Definition
1. Abs. Absent from class or required activity.
2. Acct. Account; record of financial transactions.
3. Admin. Administration; management of an organization.
4. Alt. Alternative option or choice.
5. App. Application; software program or formal request.
6. Bcc Blind carbon copy in email.
7. Bldg. Building; a structure or facility.
8. BTW By the way; casual side note.
9. Bus. hrs. Business hours when an office is open.
10. C/O Care of; mailed via another person.
11. Cal. Calendar; schedule of dates and events.
12. Conf. Conference; formal meeting.
13. Ctrl Control key; keyboard shortcut modifier.
14. Cust. svc. Customer service; help for users or clients.
15. Dept. Department; division of an organization.
16. Disc. Discount; reduced price.
17. Dist. District; defined administrative area.
18. DIY Do it yourself; self-made without professionals.
19. DM Direct message; private online message.
20. Doc. Document; written file or record.
21. EOD End of day; by close of business.
22. ETA Estimated time of arrival.
23. etc. And other similar things.
24. EVP Executive vice president; senior leadership role.
25. Ext. Extension; additional phone number digits.
26. FAQ Frequently asked questions; common help list.
27. Fwd Forwarded message sent to another person.
28. FYI For your information; informational note.
29. Gen. General; not specific.
30. Gov. Government; public administration.
31. GPA Grade point average; overall academic score.
32. HQ Headquarters; main office location.
33. HR Human resources; hiring and employee support.
34. ID Identification; proof of who you are.
35. IEP Individualized Education Program; special education plan.
36. IM Instant message; real-time text chat.
37. Inc. Incorporated; registered company status.
38. Info. Information; facts or details.
39. Int. Internal; within an organization.
40. Inv. Invoice; bill for goods or services.
41. IRS Internal Revenue Service; U.S. tax agency.
42. IT Information technology; computers and networks support.
43. JIC Just in case; for precaution.
44. Jr. Junior; younger person with same name.
45. K-12 Kindergarten through 12th grade schooling.
46. km Kilometer; distance unit.
47. KPI Key performance indicator; measurable goal metric.
48. KYC Know your customer; identity verification process.
49. LAN Local area network; nearby connected computers.
50. LLC Limited liability company; business structure.
51. Loc. Location; place or site.
52. Ltd. Limited; company with limited liability.
53. Mgr. Manager; person who supervises.
54. Min. Minute; time unit.
55. Msg. Message; written communication.
56. Mtng. Meeting; scheduled discussion.
57. N/A Not applicable; does not apply.
58. NDA Nondisclosure agreement; confidentiality contract.
59. Net Network; connected system of devices.
60. No. Number; numeric identifier.
61. Notif. Notification; alert message.
62. O/T Overtime; extra work hours.
63. OCR Optical character recognition; text from images.
64. OD Office of the director; director’s unit.
65. OKR Objectives and key results; goal tracking method.
66. Org. Organization; group with a purpose.
67. P.O. Purchase order; official buying request.
68. P&L Profit and loss; income statement.
69. PDF Portable Document Format; shareable file type.
70. Ph. Phone; telephone contact.
71. PIN Personal identification number; security code.
72. POC Point of contact; main person to reach.
73. PP Pages; page count abbreviation.
74. PR Public relations; managing public communication.
75. Proc. Procedure; official process steps.
76. Proj. Project; planned work effort.
77. PTO Paid time off; approved leave time.
78. Q&A Questions and answers; information session.
79. QC Quality control; checking standards.
80. Qty. Quantity; amount or number.
81. Req. Request or requirement; needed item.
82. Rev. Revision; updated version.
83. RFP Request for proposal; bid invitation.
84. ROI Return on investment; value gained vs cost.
85. RSVP Please respond; confirm attendance.
86. Sched. Schedule; planned times and dates.
87. Sec. Section; part of a document.
88. SOP Standard operating procedure; official routine steps.
89. Sr. Senior; older person or higher rank.
90. SSN Social Security number; U.S. ID number.
91. Stats. Statistics; numerical data summary.
92. TBA To be announced; not decided yet.
93. TBD To be determined; will decide later.
94. Temp. Temporary; not permanent.
95. Thx Thanks; quick gratitude message.
96. TOS Terms of service; usage rules.
97. U.S. United States; country abbreviation.
98. URL Web address for a page.
99. USP Unique selling proposition; key advantage.
100. UV Ultraviolet; light beyond visible spectrum.

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