(Canada, informal) A 26-ounce bottle of alcoholic drink.

plural of 26

(physics) A minor stable isotope of magnesium, ²⁶₁₂Mg, having twelve protons and fourteen neutrons; it amounts to about 11% of the element in nature

The 26 counties of the Republic of Ireland and the 6 counties of Northern Ireland together make a single United Ireland.

Abbreviation of twenty-sixth.

(slang, abbreviation) A marathon

plural of 26.2

plural of alt.2600er

(Internet slang) A participant in the Usenet newsgroup alt.2600.