| A | 667 | AA, AAA, AARP, ABC, AC, ACA, ACT, AD |
| B | 365 | B2B, B2C, BA, BBC, BC, BF, BFF, BMI |
| C | 764 | C, C-section, CA, CBC, CBS, CC, CCP, CD |
| D | 438 | DC, DE, Dec, DFW, DHS, DIY, DJ, DM |
| E | 429 | E, E. coli, ED, e.g., EMS, EPA, ER, ERA |
| F | 391 | F, F1, FAA, FAFSA, FAQ, FBI, FDA, Fe |
| G | 289 | G, G7, GA, gal, GB, GBP, GDP, GE |
| H | 356 | H, HBO, HD, HHS, HI, HIPAA, HIV, HMO |
| I | 415 | IA, IBM, ICBM, ICE, ICU, ID, IDK, i.e. |
| J | 110 | Jan, JD, JK, JPEG, JPG, JPY, Jr., Jul |
| K | 110 | K, K-12, KFC, kg, KIA, KJV, km, km/h |
| L | 371 | L, LA, LAX, lb, LED, LLC, LMAO, log |
| M | 544 | M, MA, Mar, MB, MBA, Mbps, MD, ME |
| N | 492 | N, N/A, NASA, NASCAR, NATO, NBA, NBC, NC |
| O | 321 | O, OA, OCD, OCT, OH, OK, OMG, OR |
| P | 582 | p, PA, PC, PDF, PG-13, pH, PhD, PIN |
| Q | 92 | QB, QLD, Q&A, Q1, Q2, Q3, Q4, QC |
| R | 348 | R&B, R&D, RAM, RBI, RD, Rev., RI, R.I.P. |
| S | 688 | S, S&P 500, SAT, SC, SCOTUS, SD, SEC, SEO |
| T | 409 | tan, TB, TBD, TBH, Tbsp, TD, Thu, TL;DR |
| U | 311 | UCLA, UK, UN, UPS, URL, US, USA, USB |
| V | 189 | V, VA, VIC, VIP, VP, VPN, VR, VS |
| W | 230 | W, W-2, W-4, WA, Wed, WHO, WI, Wi-Fi |
| X | 47 | XL, XLSX, Xmas, XO, XOXO, XP, XD, xG |
| Y | 54 | yd, YMCA, yr, YTD, y/o, YA, YOLO, YoY |
| Z | 29 | ZIP, z, ZAR, ZRH, Z-Pak, ZA, ZIP+4, Zn |
| 0–9 | 225 | 1040, 1099, 401(k), 4G, 4K, 501(c)(3), 5G, 911 |