Please help identifying these two marks on a step up transformer

[Goophy629]

They are on a 110/120v to 220/240v step up transformer (those travel size thing),
not sure what they really mean.

[bob91343]

I suspect the second one indicates for indoor use only.

[Cubdriver]

The first one appears to indicate that it is an isolation transformer (no electrical connection between primary and secondary)

https://www.iso.org/obp/ui#iec:grs:60417:5222

-Pat

[old-jo]

For the first symbol: http://www.cycloflow.com/2014/11/markings-and-symbols-on-transformers.html

• Equipment designed for indoor use only.
• The IEC 60417-5957 (ISO symbol does not have the arrow)

The ISO/IEC symbol that does not have inside-pointing arrow: https://www.iso.org/obp/ui#iec:grs:60417:5957

[Goophy629]

  thanks all for the info