What is a mnemonic device?

A mnemonic device is any technique that helps encode information in a way that is easier to remember. The first-letter (acrostic) type creates a sentence where the initial letter of each word corresponds to something you need to memorise.

Famous first-letter mnemonics

ROYGBIV - rainbow colours: Richard Of York Gave Battle In Vain
EGBDF - treble-clef lines: Every Good Boy Deserves Fudge
HOMES - Great Lakes: Huron, Ontario, Michigan, Erie, Superior
BODMAS - order of operations: Brackets, Orders, Division, Multiplication, Addition, Subtraction

Tips for creating your own

Choose words that are vivid, concrete, and emotionally resonant - these are easier to recall than abstract words. A silly or surprising phrase is often more memorable than a sensible one.

Types of mnemonics

Type	Description	Example
First-letter (acrostic)	Sentence where initials spell out the list	"Every Good Boy Deserves Fudge" for EGBDF
Keyword method	Sound-alike word links foreign word to meaning	Spanish carta (letter) -> imagine a shopping cart full of letters
Peg system	Pre-memorized number-word pairs; hook new items onto them	1=bun, 2=shoe, 3=tree… hang list items on each peg
Story method	Weave items into a narrative in sequence	Link grocery items into a bizarre story you walk through
Method of loci	Place items along a familiar route	Ancient Greek and Roman orators; the "memory palace"

The method of loci (memory palace)

The method of loci is one of the oldest and most powerful mnemonic techniques, dating to ancient Greek and Roman rhetoric. Choose a familiar route - your home, a walk to school, or a street you know well. Mentally place each item you need to remember at a specific landmark along that route. To recall the list, mentally "walk" the route and encounter each item in order.

Memory champions use elaborate palaces with hundreds of locations to memorize decks of cards, long digit sequences, and word lists at competition speed. The technique works because it leverages spatial and episodic memory, which are among the strongest memory systems in the human brain.

Science basis

Mnemonics work through two well-studied principles:

Elaborative encoding: connecting new information to rich existing knowledge creates more retrieval pathways than rote repetition.
Distinctive processing: bizarre, unusual, or emotionally charged associations are more memorable than generic ones - the "von Restorff effect" (isolation effect).