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Build a pictogram practice round

Choose 5 for a short drill or 9 to practice the complete GHS pictogram set.

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Symbol recognition

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Road Signs Quiz Practice 25 common US MUTCD regulatory and warning signs with repeatable rounds, immediate feedback, and focused review of misses.
Maritime Signal Flags Quiz Practice all 26 ICS letter flags and ten numeral pennants with repeatable rounds, immediate feedback, and missed-signal replay.
Country Flags Quiz Practice 194 country flags in seeded world, regional, ASEAN, EU, or Commonwealth rounds with flexible feedback and missed-flag review.
Braille Alphabet Quiz Practice visual recognition of Braille letters and digits with complete dot-pattern feedback, saved rounds and same/new/missed replay.

Hazard pictograms compress an important warning into a symbol that can be recognized before every word on a chemical label is read. Under the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), each pictogram uses a black symbol on white inside a red diamond and points to one or more broad physical, health, or environmental hazard classes.

The symbol is only one part of the label. Product identity, a signal word, hazard statements, and precautionary statements supply the details needed to judge severity and choose safe handling steps. The Safety Data Sheet (SDS) adds information about exposure controls, storage, first aid, and emergency response.

Several symbols are easy to confuse if they are learned by name alone. A plain flame marks fire-related hazards, while a flame over a circle marks oxidizers that may cause or intensify fire. The exclamation mark covers harmful or irritating effects; the skull and crossbones signals more severe acute toxicity. The person silhouette with a chest starburst points toward serious or longer-term health effects.

QuestionBest source
What broad kind of hazard is present?Pictogram
How severe is the classified hazard?Signal word and hazard statement
What precautions should be taken?Precautionary statements and SDS
Which rules apply in this workplace or country?Current local regulation and employer training

Recognition practice helps with the first question only. It cannot classify a product, replace a current label or SDS, or establish that the same pictogram is mandatory in every jurisdiction. In the United States, OSHA requires eight GHS pictograms under its Hazard Communication Standard; the environmental pictogram is not mandatory under that standard because environmental hazards fall outside OSHA’s jurisdiction.

How to Use This Tool:

Use a short round for recall practice or the nine-question round for complete bank coverage.

  1. Choose 5 or 9 questions. A nine-question round presents every pictogram once; a five-question round samples the bank without replacement.
  2. Keep the Replay seed for a controlled retest. The same seed, set, and count reproduce the question and answer order.
  3. Inspect the symbol and choose its broad hazard meaning. Read the immediate explanation before moving on, especially when two symbols look related.
  4. Review missed symbols after completion. Use the answer ledger for the selected and correct meanings, then retry only the misses or start a new seed.
If a public pictogram image cannot load, that prompt is blocked and is not scored. Use the recovery action to start a valid replacement session rather than guessing from an empty frame.

Interpreting Results:

The score measures exact symbol-to-label matches in one round. Read each missed explanation before looking at the percentage; a confusion between the ordinary flame and flame over circle calls for a different review than a confusion between acute and chronic health hazards.

A perfect round shows that every presented match was correct. It does not demonstrate product-specific hazard knowledge or readiness to handle chemicals. Confirm real decisions against the container label, current SDS, workplace procedures, and applicable regulation.

Technical Details:

The bank covers all nine UN GHS pictograms and maps each image to one broad hazard-family label. Several pictograms span multiple hazard classes, so the table is a recognition map rather than a complete classification matrix.

Lookup Core:

PictogramBroad meaning used in practiceRecognition cue
Exploding BombExplosives and some self-reactive substances or organic peroxidesBursting object and fragments
FlameFlammables, pyrophorics, self-heating substances, emitted flammable gas, and related fire hazardsPlain flame without a circle
Flame Over CircleOxidizers that may cause or intensify fireFlame sitting above a circle
Gas CylinderGases under pressureHorizontal cylinder
CorrosionSevere skin burns, eye damage, or corrosion of metalsLiquid attacking a hand and metal
Skull and CrossbonesSevere acute toxicity that may be fatal or toxicSkull above crossed bones
Health HazardSerious or long-term effects such as carcinogenicity, respiratory sensitization, or target-organ toxicityPerson silhouette with chest starburst
Exclamation MarkHarmful acute toxicity, irritation, skin sensitization, or respiratory irritationExclamation mark
EnvironmentHazard to the aquatic environmentDead tree and fish

Formula Core:

A correct match earns one point and an incorrect match earns zero. Accuracy divides correct matches by all questions in the selected round.

C = ∑i=1Nci A = 100×CN

N is 5 or 9, ci is 1 for a correct response and 0 otherwise, C is the point score, and A is the canonical accuracy percentage. The visible percentage label rounds to the nearest whole percent. Seven correct answers in a nine-question round produce 7 points, an accuracy value of about 77.78%, and a displayed label of 78%.

Mechanism Core:

Selection is seeded and without replacement. Each prompt receives the correct meaning plus three distinct distractors from the same nine-symbol bank. A replay is comparable only when the set, count, and seed stay fixed. Retry-missed mode starts a new attempt containing only symbols answered incorrectly; it does not revise the completed score.

Safety and Source Notes:

The learning bank follows the nine-pictogram set in UN GHS Revision 11. National adoption can differ, and a chemical’s actual pictograms depend on its formal hazard classification.

  • Never infer handling instructions from the pictogram alone; read the full label and SDS.
  • The pictogram images are requested from Wikimedia Commons. Those requests are visible to that public media service.
  • One round measures recognition only and should not be treated as workplace training completion.

Worked Examples:

Flame or oxidizer

A miss between Flame and Flame Over Circle is best corrected by checking the base of the symbol. The circle identifies an oxidizer; its danger is that it may intensify fire even when the substance itself is not the ordinary fuel represented by the plain flame.

Acute or longer-term health hazard

If the skull is confused with the chest-starburst silhouette, compare timescale and effect. The skull marks severe acute toxicity, while the health-hazard silhouette covers serious effects such as carcinogenicity, respiratory sensitization, or target-organ toxicity.

References: