Permutation Symbol nPr

nPr is the encoded form covered by Permutation Symbol, with Unicode identity U+006E U+0050 U+0072 LATIN SMALL LETTER N + LATIN CAPITAL LETTER P + LATIN SMALL LETTER R. nPr is a plain-text permutation notation for the number of ordered selections of r objects from n objects. It is also written P(n,r) or n!/(n-r)!. In mathematical use of Permutation Symbol, the neighboring operands and grouping define the scope of nPr. Approved examples include 5P2 = 20, P(6,3) = 120, nPr = n!/(n-r)!, and Ordered selections: 8P3. Editors most often encounter this form in Combinatorics, Probability exercises, Counting problems, and Spreadsheet formulas. Define variables, sets, or propositions before nPr appears, and keep the complete expression visible. The canonical scope is limited as follows: This page covers permutation notation, not one dedicated Unicode character. The most likely errors are using P(n,r) where nPr is required changes the intended permutation symbol or introduces a different code point, copying only part of U+006E U+0050 U+0072 instead of the full nPr sequence, and applying the wrong convention to permutation symbol in probability exercises; specifically, treating the notation as one Unicode code point. The reviewed formatting guidance is specific. In combinatorics, identify nPr as Permutation Symbol and explain the exact role it performs before the reader relies on it. For probability exercises, retain the sequence U+006E U+0050 U+0072; do not silently replace nPr with the related form P(n,r). When permutation symbol appears in counting problems, apply this convention: Define every variable and index in the notation. Give nPr the readable label “Permutation Symbol” wherever the surrounding sentence, formula, score, table, or control does not already state the meaning. In encoded text, decimal n P r and hexadecimal n P r reproduce the form, and the CSS escape is 6E 50 72. Use structured math markup for long expressions, and give the complete expression an accessible reading rather than naming nPr in isolation. The review basis for Permutation Symbol combines Unicode, W3C/WCAG, WHATWG HTML, and NIST DLMF. Those references support the encoded identity U+006E U+0050 U+0072 and the limited use described for permutation symbol.