Even if your assumption is correct, it's still not right.
None of the above carry the units - or are recognisable symbols - of energy.
In these days of dumb celebrity it may be trendy to appear careless but that doesn't make use of nonsense units right either.
On the other hand, the use of 'fpe' for Energy does at least imply the correct units (Foot Pound Energy) as long as you make the assumption that folk understand what the 'F', 'P' and 'E' stand for.
Seems to me that it would be better to use the proper (Ft.Lb or Ft.Lbf) units in the first place since that's what extracting the units from ½.m.v² gives us.
George