Any idea what this DB circuit symbol is?

[MrPupsi]

Was at a job for a different reason, but saw this and was curious.
Asked the tenant, and they didn't know what it was for either.

Any ideas? Its obviously come from a Hager DB sticker pack.

I'm guessing as its a 6A, smoke alarm?

 

[Mike Johnson]

Most electricians writing is worse than a doctor, never seen a legible written one yet. Tin hat on.

 

[Lister1987]

Radio transmitter, the tenant into HAM radio?

 

[Moley]

Most electricians writing is worse than a doctor, never seen a legible written one yet. Tin hat on.

I would imagine Buzz's would be perfect ?

 

[telectrix]

Most electricians writing is worse than a doctor, never seen a legible written one yet. Tin hat on.

i have to admit to neat writing. my lad on the other hand.... his looks like it's done by a drunken spider with parkinsons.