The term, "Diode Steered" is commonly used in commercial splitter product descriptions, like on this Blonder Tongue catalog page:
...and on this Holland Electronics catalog page:
Update, at October 3, 2:00 PM. I just serviced a residential antenna installation that combined two off-air antennas and used an MCR splitter with the part number TG-202D, and it had the term Diode Steered printed on its label. http://www.satelliteguys.us/attachment.php?attachmentid=8031&d=1142979073
A lot of commercial distributors are desperate enough for sales that they now sell in small quantities, so any hobbyist that calls a commercial distributor and gets to talk with a sales rep can expect to hear them so-described.
None of the loose, cable/broadcast frequency splitters I have on my truck actually say in English that they do or do not pass power. They just use lines drawn on the labels to depict the powering path. I don't know if I've actually seen diode-protected or diode steered splitters that were limited to cable.broadcast frequency band. There are still a lot of old european distribution splitters rated for 450 to 1,750 MHz that are available cheap that pass power on all ports but are not diode protected. They are all larger than most domestic splitters and have gold finishes but no brand names. Funny thing is, many of the ones rated for 450 to 1,750 MHz severely choke out channels VHF 4 and cable 16, which are harmonics of one another, whereas the ones that say 900 - 2,150 MHz sweep out just fine over the entire cable/broadcast TV band.
In the 1990s, almost none of the all ports power passing satellite frequency (L-band cable) splitters were diode protected or steered. In that era, they were commonly used in master antenna system headends where multiple Videocipher receivers were connected to dedicated LNBs, and where the receivers were the sole source of LNB powering. The european domestic satellite systems of that era with which I was familiar used stacking LNBs, so voltage switching was not necessary to make the full L-band spectrum simultaneously available to the multiple, connected receivers.
I had one, two-way diode steered splitter where the diodes were deliberately going the "other" way. I used to actually remember why I was carrying it around. I think there might have been some old C-band stuff from the late 1980s that used a negative voltage on a center conductor.Edited by AntAltMike - 10/7/13 at 8:33am