magick wrote:

> <sup> is easier to remember than U+00B2.
> 
> Making it faster and easier to write, for example, E=MC<sup>2</sup>

"Faster and easier to write" isn't, however, a reasonable criterion to 
evaluate whether or not the element as it is has any semantic value.

P
-- 
Patrick H. Lauke
__________________________________________________________
re·dux (adj.): brought back; returned. used postpositively
[latin : re-, re- + dux, leader; see duke.]
www.splintered.co.uk | www.photographia.co.uk
http://redux.deviantart.com 
__________________________________________________________
Web Standards Project (WaSP) Accessibility Task Force
http://webstandards.org/ 
__________________________________________________________