Extension Abbreviation

Appropriate acronym for Extension (US) (Telepen)? 3

I will be applying for a business card soon and will have a business phone number with an extension. What would you put next to () X? I've seen everything from EXT: to, for example, ...

Thanks!

1234. Expansion

Example 1234

x1234

These are all appropriate and common uses.

Abbreviation for position

Abbreviation for extension

Extension Abbreviation

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D:
Appropriate acronym for Extension (US) (Telepen)?
I will be applying for a business card soon and will have a business phone number with an extension. What would you put next to () X? I've seen everything from EXT: to, for example, ...
Thanks!
(555) 5555555, 1495. Expansion
EXT.
We