Jargon

This is a table of terminology aka jargon related to both the 3DS and ACNL. Some of the terms aren't mentioned in the website itself, but are good to know regardless. Terms have been extracted from two GBAtemp links, the Glossary of Common 3DS Hacking Terms and the 3DS Glossary on the GBAtemp wiki.

Term	Description
amiibo	Series of figures by Nintendo that contain an NFC chip used to communicate with 3DS and WiiU consoles. On the new Nintendo 3DS, the Amiibo can be connected by placing the figure on the bottom screen. For the old 3DS, a separate adapter needs to be bought, as it does not have NFC capabilities.
Boot9Strap (B9S)	A modified firmware that makes use of sighax and a vulnerability in the console's NDMA engine to gain code execution on the ARM9 BootROM (Boot9) and load a payload ("boot.firm") from the SD card. It uses a modified version the ARM9 payload loader of Luma3DS. The software can also dump the console-specific OTP and BootROMs.
Cartridge (cart)	A plastic casing containing variable content, for example, a PCB containing a game held on ROM including a backup EEPROM/battery to hold the game save. Here, this term is commonly used to describe a 3DS game card or any other device used to slot into the expansion slots of a handheld, even flash kit adapters.
CFW	Short for Custom FirmWare. While this term can be debated until the cows come home, in the 3DS scene, it typically means when you're running NATIVE_FIRM with signatures disabled.
CIA	This stands for CTR Importable Archive. It's like a WAD file from the Wii days; it's just a container that contains game files or system firmware updates. Installing these will either install a game (to the SD card) or parts of a system firmware update to your 3DS' NAND (if on emuNAND, then it'll obviously install to the SD card's emuNAND).
eShop	An online store for the Nintendo 3DS and Wii U where digital games, demos, and other things can be downloaded.
Firmware	The code that a device runs from. A device which allows for firmware upgrades means that a new version of the device doesn't need to be bought to get new features.
Luma3DS	A popular Custom Firmware (CFW) for the Nintendo 3DS that sports a variety of features, such as payload chaining and on-the-fly game patching.
Micro SD	A smaller version of the SD card. About half the size of a mini SD and about a quarter of the size of a normal SD card. Can hold just as much data as a normal SD card.
N3DS/New3DS	"New" 3DS. As in, the model that Nintendo released in late 2014 with Super Stable 3D, the C-stick, and ZL/ZR buttons, and an 804Mhz CPU speed. The New 2DS is the same, except with no 3D features.
Nintendo Network	A network of servers by Nintendo used for online play.
Nintendo Network ID (NNID)	An unique ID used by people to identify on the Nintendo Network. Intended to replace the older friend codes system. Can only be used on 1 Nintendo 3DS console at a time.
NTR CFW	Though NTR CFW has "CFW" right in its name, this is NOT what people typically refer to when they talk about CFW. If people ask if you have CFW, NTR is N O T what they're asking about. Usually they're looking for something else like Luma3DS. NTR CFW is a CFW that isn't installed like traditional CFW, instead it's launched by programs such as BootNTR or BootNTR Selector. Using NTR, you can do various things, but the primary reason people use it is to load .plg files that can have a variety of applications. These .plg files can be plugins for cheats like the ACNL one this page is for or for additional features such as streaming or an FPS counter in your games. NTR is not permanent. It will disappear as soon as you reboot your 3DS, so the launcher must be used each and every time you plan to use NTR.
O3DS/Old3DS	"Old" 3DS. Any 3DS model that isn't a "New" 3DS and runs at only 268MHz. This terminology includes the original 2DS, usually.
OFW	Official/original firmware. The unmodified firmware installed on your console, without any hacks applied.
SD Card	Acronym for Secure Digital cards. It is a flash memory card format used in the 3DS and several other portable devices.
SDHC	SD High Capacity. Refers to SD cards that are larger than 2GB, up to 32GB.
SDXC	SD eXtended Capacity. Refers to SD cards that are larger than 32GB, up to 2TB. The 3DS supports SDXC cards up to 128GB if formatted as FAT32.
sighax	An exploit, using a flaw in the RSA signature checks of the ARM9 BootROM (Boot9) to load unofficial firmware images.
System Menu	The menu used on the 3DS.
Title	A title is an application for the 3DS, which has a unique identifier. Examples are 3DS games and system applications such as Mii plaza.
Wi-Fi	Short for "Wireless fidelity". Wi-Fi is a type of wireless LAN. This makes it possible for a Wi-Fi enabled device, such as the Nintendo 3DS, to access an internet connection shared via a wireless LAN without any additional wires or connections.

Term	Description
ACNL	Stands for Animal Crossing New Leaf.
NLSE	NLSE is an offline ACNL save editor which functions the same as the online editor and more.
NLTK	New Leaf Toolkit. It's a WIP ACNL Toolkit/Save Editor without the hassle of taking out your SD card. Only CFW is needed to use it.
PWP	Stands for public works projects. Projects allow the player to customize their town by adding new buildings, upgrading existing buildings, and adding various features to areas throughout their town (from Nookipedia)
Orig	Original means the version of Animal Crossing New Leaf that has Welcome Amiibo installed from an update. Its Home Menu icon looks like this:
QM	Quick Menu. Quick Menu gives quicker access to some cheats, such as watering flowers, setting the time, modifying your appearance, give yourself a furniture set, and more. You hold R + X for a small bit when you're not in any other menu to open the Quick Menu.
RTBM	Real Time Building Modifier. Allows you to place, remove, or move a building.
RTWE	Real Time World Editor. Allows you to edit your ACNL town in real time.
Seeding	Seeding is a term used for the general act of being able to place buildings and items in online play. This includes items such as trees, rocks, buildings (such as Town Hall and houses), so it can be very detrimental for a player that can't do anything about it.
WA	WA means Welcome Amiibo. This version has Welcome Amiibo built into the game. Its Home Menu icon looks like this: