fot?

[Bob Tennent]

 >|here is a question a never dared to ask:
 >|What do f o and t stand for in the suffix .fot?

It might help if you told us which file has the .fot suffix :+)

Here are some from CTAN:

obsolete/graphics/metapost/base/source/texk/web2c/triptrap/mftrap.fot
obsolete/graphics/metapost/base/source/texk/web2c/triptrap/trip.fot
obsolete/systems/e-tex/v2/etrip/etrip.fot
systems/knuth/dist/mf/trap.fot
systems/knuth/dist/tex/trip.fot
systems/unix/tex-gpc/traplog/trap.fot
systems/unix/tex-gpc/triplog/trip.fot

Bob T.