Insert company data as fields within website

Is there a plugin or hack available to allow me to set variables and insert them into the site using something similar to shortcodes?

For example, say I have a phone number that may need to be updated, I would like to update this in one place (a variable in the admin area) and have this them update every instance throughout the site.

I’ve looked at shortcode plugins but I’m not sure this is what they’re aimed at?

Many thanks.