PO box means a numbered post-office box used to receive mail. Cambridge records forms including “PO box,” “PO Box,” and American “P.O. Box,” so formatting can depend on address style and regional convention.
ReviewedEvidence1 sourceSectionWriting & Style
Quick answer
PO box means post-office box. “PO Box” and “P.O. Box” are both documented forms; follow the applicable postal or house style.
Key details
Core IssuePO box is a postal-address term with documented capitalization and punctuation variants.
Phrase Roleaddress abbreviation
Registerpostal and professional writing
Important caveats
Formatting Boundary
Cambridge shows PO box, PO Box, and P.O. Box across its dictionaries, so one punctuation form should not be presented as universal.
Further guidance
Meaning
Cambridge defines PO box as a numbered box at a post office used to receive mail.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
B2B describes business-to-business activity, while B2C describes business-to-consumer activity. Cambridge documents uppercase and lowercase variants plus B-to-B/B-to-C forms, so capitalization should follow house style while the underlying meanings stay distinct.
CAGR means compound annual growth rate, a smoothed annualized growth rate over a period longer than one year. Use the uppercase initialism consistently and state the start/end period; do not imply that CAGR shows volatility or the exact growth in each intervening year.
Care of, abbreviated c/o, is an addressing device for routing correspondence through another person or place. It should be kept distinct from attention lines, CC fields, and other communication labels.
EBITDA means earnings before interest, taxes, depreciation, and amortization; it is a widely used financial performance metric but not itself a GAAP or IFRS line item. Write EBITDA in capitals, define it for non-specialist readers, and avoid presenting it as a standardized GAAP/IFRS measure without qualification.
LLC is an abbreviation for “limited liability company.” In running text and company names, preserve the organization’s official legal styling rather than inventing punctuation or expanding it unnecessarily.
