A Peg System is a pre-memorized list of anchors—rhyming words, shapes, or lettered objects—that serve as mental hooks to which new information can be attached. Because the pegs are ordered, items can be recalled in sequence simply by retrieving the attached association at each position. The three classic variants are the Number-Rhyme, Number-Shape, and Alphabet Peg Systems. The Number-Rhyme system pairs each digit with a word that rhymes with it: 1 is bun (or gun), 2 is shoe, 3 is tree, 4 is door, 5 is hive, 6 is sticks, 7 is heaven, 8 is gate, 9 is wine, and 10 is hen. The Number-Shape system instead pairs digits with objects that visually resemble them: 1 is a candle, 2 a swan, 3 a heart on its side, 4 a sailboat, 5 a hook, 6 an elephant's trunk, 7 a cliff, 8 a snowman, 9 a balloon on a string, and 0 a cannonball. The Alphabet Peg System assigns memorable words to the 26 letters—A is Ace, B is Bee, C is Sea, D is Door—and extends ordered recall to longer lists. Published lists vary slightly between sources, with the modern rhyming list popularized in the twentieth century by Harry Lorayne, so consistency matters more than which exact variant is chosen.
In every peg system the attachment procedure is the same: form a vivid, interactive mental image combining the item to be remembered with its peg. To remember "milk" on peg 1, for example, the learner might imagine a giant bun floating in a lake of milk; bizarre interactions are more memorable than passive ones. Peg systems have several advantages over the Method of Loci for certain tasks. They are faster to learn because no spatial route needs to be built, they are highly portable since the pegs are the same in any context, and they are ideal for arbitrary ordered lists of 10 to 26 items. Their main limitation is the fixed capacity of the master list: a learner must first memorise the peg list itself, which is a real upfront cost, and the list typically tops out at 10, 26, or 100 pegs unless deliberately extended. Because pegs lack spatial context, their retrieval cues are generally weaker than those of an ordered memory palace, and they tend to degrade without occasional review. For ordered recall of unrelated items, peg systems are far superior to simple chunking, which reduces load without preserving sequence.
The peg family includes several useful variants beyond the basic 10-item lists. The Body Peg System uses body parts in a fixed sequence—head, shoulders, knees, toes, and so on—as loci for ordered recall. The Clock Face technique assigns the 12 positions of an analog clock as pegs, placing items clockwise around the dial. Spelling-alphabet pegs differ from rhyme pegs by relying on letter-to-number or spelled-out-number imagery rather than sound similarity. Color-shape peg systems assign each digit a distinctive color and shape, and category peg systems divide pegs by topic so that 1–10 might serve countries while 11–20 serve presidents, multiplying available capacity without interference. Extended peg systems reach hundreds of pegs by compounding (11 = one-one) or themed lists. Peg systems are widely used in everyday contexts: shoppers can attach a list to ten pegs, public speakers can anchor main points in order, learners can chain vocabulary to a numbered vocabulary peg list for rapid ordered retrieval, and to-do lists can be organized by priority simply by assigning the most important task to peg 1. To remember a name and face, the learner converts the name to a vivid image ("Mr. Carpenter" → a hammer) and places that action on a prominent facial feature such as the nose or ears.