Strange symbol on PSU label

This is an SMPS symbol from the IEC 60417 standard. It identifies an

electronic device incorporating transformer(s) and electronic circuitry(ies), that converts electrical power into single or multiple power outputs.

There's also a similar symbol for a linear PSU:

The PSU must have an internal operating frequency below 500 Hz to be considered linear by the standard.

Power supply unit, switch mode.

ISO Standard Reference No : 6190 Registration date : 2013-10-19

Status : Active

Standard :

IEC 60417 — Graphical Symbols for Use on Equipment

Committee :

IEC/SC 3C

ICS :

https://www.iso.org/obp/ui#iec:grs:60417:6190