Plates

Plates (also called Sheets) are a type of crafting component, originally from GregTech. Flaxbeard's Steam Power, Immersive Engineering, IndustrialCraft 2, and Tesla Core Lib also use them.

Flaxbeard's Steam Power
Plates from Flaxbeard's Steam Power (FSP) are much different than standard plates. They use the Ore Dictionary prefix "plateSteamcraft" rather than simply "plate". Plates in Flaxbeard's Steam Power are made using a Plate Mold with the Crucible, and can only be used in its own recipes, unless specifically allowed by the other mods. This is a balance design choice since FSP plates only cost 6 nuggets worth of material, while other mod plates typically cost much more of the material than that.

Additionally, these plates are not effected by GregTech's meta-material system, so only explicitly implemented plates will exist, despite GregTech's installation.

Immersive Engineering
Aluminium, Copper, Electrum, and Steel Plates are a step in crafting Wire Coils, an essential power component. Most metal plates have unique uses, and all are craftable into Sheetmetal.

IndustrialCraft 2
Plates were originally added to replace Refined Iron.

There are also 3 special plates: the Advanced Alloy, Carbon Plate and Iridium Reinforced Plate. The Advanced Alloy and Carbon Plates are made in the compressor, and the Iridium Reinforced Plate is crafted. More detailed information can be found on each plate's page.

In FTB Infinity Evolved, the IC2 crafting recipe is changed.

Tesla Core Lib
Tesla Core Lib adds Sheets but they cannot be crafted without other mods.