A page of the Numeropedia - the Special Encyclopedia of Numbers
[Language] Octogenarian is a person whose age is 80 to 89 years old.
[Sport] The jersey numbers most usually worn by American football players in the wide receivers and tight-end positions. Wide receivers are now allowed to wear number 10-19, too
87, 88 & 89 (and 90 & 91)
[Tech.] Octane (R+M)/2 antiknock index rating of unleaded gasoline for automobiles in the U.S.: 87, 88, 89, 90 and 91.
[Library] Numbers 000-099 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Generalities (Bibliographies, Encyclopedias, Magazines and Computer Science…). Numbers 080-089 are for books in General Collections.