science

Price look-up code

Price look-up code is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Price look-up code rather than just read about it. In short: Price look-up codes, commonly called PLU codes, PLU numbers, PLUs, produce codes, or produce labels, are a system of numbers that uniquely identify bulk produce sold in grocery stores and supermarkets. The codes have been in use since 1990, and over 1,400 have been assigned.

Key takeaways

Price look-up code belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Price look-up code to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Price look-up code from memory before moving on to harder problems.

Reference excerpt

Price look-up codes, commonly called PLU codes, PLU numbers, PLUs, produce codes, or produce labels, are a system of numbers that uniquely identify bulk produce sold in grocery stores and supermarkets. The codes have been in use since 1990, and over 1,400 have been assigned. The codes are administered by the International Federation for Produce Standards (IFPS), a global coalition of fruit and vegetable associations that was formed in 2001 to introduce PLU numbers globally. Produce labeled with PLU codes eliminates the need for grocery store checkers and customers to visually identify different varieties, which can make check-out and inventory control easier, faster, and more accurate, something that is important when varieties of produce look similar, but have different prices, such as organic and conventional (non-organic) varieties.

Uses PLU codes are used primarily in retail grocery stores or supermarkets, where they are keyed into point of sale systems by cashiers or by customers at self-checkout machines when the produce is being weighed or counted. The codes may be printed on small stickers, tags, or bands that are affixed to produce, or may be printed on signs. Since 2006, stickers with PLU codes may also have a GS1 DataBar Stacked Omnidirectional barcode.

Numbering conventions Conventional produce is randomly assigned four-digit PLU codes in the 3000 and 4000 series. Organic produce may be designated by prefixing the four-digit conventional PLU with a 9. Numbers 83000-84999 were supposed to be used for GMO productions, but they were opened for general use after GMO growers declined to use them.

Retailer-assigned codes

Some PLU code ranges are reserved for retailers. This allows codes to be defined by individual retailers or location, and allows the use of PLU codes in lieu of barcodes. There are retailer-assigned ranges for general and category-specific use. For example, 3170–3269 can be assigned by retailers to any goods, while 4193–4217 can only be assigned to apples. Suppliers may coordinate with their retailers to use the same code in the retailer-assigned range for a specific product.

Promotion via PLU stickers Some producers have obtained a license to place characters on stickers on PLU code labels, often as a promotion for a movie, television show or other media franchise. For example, Imagination Farms has marketed produce with collectible Disney character stickers such as Toy Story and Finding Nemo under the Disney Garden brand, and Chiquita has marketed bananas with Minions stickers on them, along with a competition.

Collecting Although the collecting of PLU labels as a hobby already existed for a while, it became widespread through social media presence and fashion designs that use fruit stickers. The popularity of the hobby was further increased by online catalogs and collector clubs. In addition to illustrations, important factors for collectors are compositions of these stickers and the type of product they are used on. Most popular materials for creating PLU code stickers are plastic film and paper, however cardboard, metallized film, wrapping tissue, and textiles are also known to be used.

Environmental concerns Although PLU labels are recognized globally and most chain supermarkets use them, they sometimes cause rejection of the fruits and vegetables to which they are attached from being accepted for composting disposal or disposal by cruise ships at sea. Generally, they are not made of biodegradable material.

Illustrations

Worked examples

Example 1 — a first encounter with Price look-up code

Start with the simplest possible case. Write down what Price look-up code claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Price look-up code before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Price look-up code ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Price look-up code

In research: Price look-up code appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Price look-up code in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Price look-up code is common in secondary-school and first-year university syllabi. It links to neighbouring topics Identifiers, Product classifications, so understanding it makes those chapters shorter.
In everyday life: Look for Price look-up code outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Price look-up code in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Price look-up code means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Price look-up code out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Price look-up code in simple terms?

Why does Price look-up code matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Price look-up code?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Price look-up code.