Originally Posted by
pbarnette
.... To that end, I would write 777s to prevent confusion with 777's, but find 'phone to be utterly silly.
Silly it may seem to the younger members here, but it's an age thing. In the days of the late King, when I started my education, it was perceived as faintly 'common' to abbreviate words such as telephone. The apostrophe was used as a means of indicating that you knew the correct word ... But were too lazy/busy to spell out in full.