Which of the following is a valid abbreviation for a gallon?

• A. gal
• B. galon
• C. gal.
• D. Gallon

Answer: (B)

Abbreviations for units should be short, clear, and widely recognized. For a gallon, the standard abbreviation is gal. It’s the concise form commonly used in recipes, labels, and measurements, and it avoids confusion. Writing galon isn’t an established abbreviation; it looks like a misspelling of the word gallon and would not be understood as an official unit short form. Using gal. with a period appears in some older texts or style guides, but many modern usages omit the period. The full word, Gallon, is simply the long form and not an abbreviation. So the valid abbreviation among typical quickly-recognizable forms is gal.