Transformer rating plate connection symbol

[Labbakutur]

Hi everyone,

Please assist me understanding a transformer rating plate. I don't understand the symbol encircled with red on the attached image. Could this be a symbol for the OLTC shaft? A neutral CT? Does anyone know?

Thank you in advance for your assistance.

 

[FPelec]

I think it's just the OLTC with its shaft and its control cabinet on the tank.

Si duri puer ingeni videtur,
preconem facias vel architectum.