Please if anyone know what does mean this symbole. 
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4\$\begingroup\$ Looks like 'no rainbow-sized springs when there's a train coming'... \$\endgroup\$– TonyMJan 18, 2022 at 14:21
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1\$\begingroup\$ The friendly manual is likely to have many pages about things you shouldn't do with the product, explaining this weird barb wire symbol. \$\endgroup\$– LundinJan 18, 2022 at 14:31
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\$\begingroup\$ And unfortunately this is probably a symbol from some ISO standard... There's a lot of incredibly bad standards for international symbols. \$\endgroup\$– LundinJan 18, 2022 at 14:33
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1\$\begingroup\$ @Lundin I don't think this symbol is that bad. That is a very common way of drawing insulation in building drawings etc. \$\endgroup\$– Klas-KennyJan 18, 2022 at 14:40
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\$\begingroup\$ @Klas-Kenny I wouldn't know about that, but I suppose "don't place insulation in the roof above this light" could be a sensible interpretation. Maybe this question shouldn't be asked here but at a construction (web) site? \$\endgroup\$– LundinJan 18, 2022 at 15:00
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1 Answer
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To me it seems to imply that the upper part of the LED fixture (when mounted in a ceiling) should not be covered with cavity insulating material i.e. it needs to keep cool by using circulatory air in the ceiling cavity. After all, it is a 24 watt device and it will need to be kept cool.
User Klas-kenny found this link that appears to confirm my suspicion: -
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1\$\begingroup\$ This is indeed correct. Very common on LED lights, described here, for example: ledbenchmark.com/faq/… I'm pretty sure this symbol is defined by IEC or similar, although I cannot find which standard. \$\endgroup\$ Jan 18, 2022 at 14:36
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\$\begingroup\$ @Klas-Kenny good find; I shall add that to my answer. \$\endgroup\$– Andy akaJan 18, 2022 at 14:38
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1\$\begingroup\$ I would have figured no reflector housings. But for the same reason, don't want to cook the modules. \$\endgroup\$– PasserbyJan 18, 2022 at 14:45