I htink that they meant LPX or you misunderstod them here is the lowdown.
LPX
Another popular form factor used in motherboards today is the LPX and Mini-LPX form factors. This form factor was first developed by Western Digital for some of their motherboards. Although they no longer produce PC motherboards, the form factor lives on and has been duplicated by many other motherboard manufacturers. These are used in the Low Profile or slimline case systems sold widely today. The LPX boards are characterized by several distinctive features. The most noticeable is that the expansion slots are mounted on a Bus Riser card that plugs into the motherboard. Expansion cards must plug sideways into the riser card. This sideways placement allows for the low profile case design. Slots will be located on one or both sides of the riser card depending on the system and case design. Another distinguishing feature of the LPX design is the standard placement of connectors on the back of the board. An LPX board will have a row of connectors for video (VGA I S-pin), parallel (25-pin), two serial ports (9-pin each), and
mini-DIN PS/2 style Mouse and Keyboard connectors. All of these connectors are mounted across the rear of the motherboard and protrude through a slot in the case. Some LPX motherboards may have additional connectors for other internal ports such as Network or SCSI adapters. " Upgrading and Repairing PCs 6th edition
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