In formal legal writing, the standard abbreviation for plaintiff is “Pl.” In handwritten notes and law school shorthand, it’s the lowercase Greek letter pi (π). Which one to use depends on whether you’re drafting something a court or colleague will read, or taking notes for yourself.
The Formal Abbreviation: Pl.
“Pl.” is the default in edited legal documents. It appears in footnotes, parenthetical citations, and tables of authorities across law reviews and court filings. For more than one plaintiff, use “Pls.”
A few other letter-based forms turn up in practice:
- “P.” shows up in quick internal memos and personal notes. Its brevity can create confusion with other abbreviations.
- “Pltf.” appears in older clerical records and some court dockets. Still recognizable, but less common today.
- “Pntf.” is an outdated variant found mainly in historical case files.
Whichever form you choose, use it consistently throughout the document. Switching between “Pl.” and “Pltf.” in the same brief can confuse a clerk processing the filing. Most citation systems, including the Bluebook, reserve these abbreviations for footnotes, parentheticals, and tables rather than the main body of a brief.
The Handwritten Shorthand: π
Law students and attorneys taking handwritten notes almost universally use the lowercase Greek letter pi (π) for plaintiff. The convention likely took hold because π is the first sound of “plaintiff,” it’s quick to write, and it stands out visually on a crowded page.
If you need to type the symbol:
- On Windows, hold Alt and type 227 on the numeric keypad, then release Alt.
- On Mac, press Option + P.
The pi symbol belongs in personal notes, study outlines, and informal documents. Don’t use it in a court filing or a published article.
Multiple Plaintiffs
When a case involves more than one plaintiff, the letter-based abbreviation becomes “Pls.” and the shorthand doubles to “ππ.” The distinction matters: a clerk reading a filing needs to know at a glance whether one claimant or several are involved, and using “Pl.” when you mean “Pls.” can muddle the record.
The Defendant Counterpart
Anyone learning the plaintiff abbreviation almost always needs the defendant one too. The formal abbreviation is “Def.” (or “Defs.” for more than one). In handwritten shorthand, defendant is the Greek capital delta (Δ), and multiple defendants become “ΔΔ.” The π/Δ pairing is one of the first conventions law students pick up, and the two symbols contrast cleanly in dense notes.
To type the delta symbol:
- On Windows, hold Alt and type 30 on the numeric keypad.
- On Mac, press Option + J.
Plaintiff or Petitioner?
“Plaintiff” and “petitioner” describe the same functional role, but they aren’t interchangeable across all courts. Both refer to the party bringing the action, and both face an opposing party (defendant or respondent). The split is procedural: “petitioner” and “respondent” typically appear in family court, juvenile court, and custody proceedings, while “plaintiff” and “defendant” dominate standard civil litigation. The formal abbreviation for petitioner is “Pet.” If you’re taking notes and reach for π in a petitioner case, no one will misread you, but in a filed document the wrong designation looks careless. Check which set of terms your court uses before you start abbreviating.
Where These Abbreviations Belong
Federal Rule of Civil Procedure 10(a) requires every pleading to carry a caption naming the court, the file number, and the parties. The complaint must list all parties by their full names; later pleadings in the same case can name just the first party on each side and refer generally to the rest.1Cornell Law Institute. Federal Rules of Civil Procedure Rule 10 – Form of Pleadings
Once the caption has established who everyone is, “Pl.” and “Def.” are fair game in footnotes, citation parentheticals, and tables of authorities. Internal office memos and student case briefs rely on this shorthand heavily. What abbreviations don’t belong in is the main body text of a brief filed with the court, where most citation guides expect full words.