Quote Originally Posted by skimask View Post
Most of those abbreviations are listed at the bottom of the pages of the datasheets.
If not there, usually a Google-search and/or Wiki will get you the answer on whatever the abbreviation means. In this case:
Vcc = voltage common-collector, generally positive voltage input
Iol = current, output, low (sinking current)
Vih = voltage, input, high
. . . and which have nothing to do with either his question or his LED. I believe he was conveying his thanks to me, not asking another question.