((10e-12)) or ((10^^-12)) are acceptable if enclosed in double-parentheses so they're not mistaken for formulae.
George W. Bush will be reelected by a margin of at least ten per centNOT A PING LIST, merely posted to: ambrose; anymouse; areafiftyone; blam; Cincinatus' Wife; callisto; HAL9000; mhking; petuniasevan; RightWhale; Skylight; solitas
Thanks....there's always someone who will help out.