TACAN

Stands for TACtical Air Navigation http://en.wikipedia.org/wiki/TACAN

Provides the user with a distance and bearing from a ground station.

Unified Modeling Language (UML)

An object-oriented analysis and design language.

http://www.pcmag.com/encyclopedia_term/0,2542,t=UML&i=53392,00.asp

Specification and Description Language (SDL)

A modeling language used to describe real-time systems.

Digital Aeronauticl Flight Information File (DAFIF)

DAFIF stands for Digital Aeronautical Flight Information File. This is used in

http://en.wikipedia.org/wiki/DAFIF

a complete and comprehensive database of up-to-date aeronautical data, including information on airports, airways, airspaces, navigation data and other facts relevant to flying in the entire world, managed by the National Geospatial-Intelligence Agency (NGA).

Source lines of code (SLOC)

Source lines of code (SLOC) - refers to measurement of the size of a software program.

See: http://en.wikipedia.org/wiki/Lines_of_code

Versioned Object Bases (VOBs)

This is in reference to ClearCase. (VOB)

http://techpubs.sgi.com/library/dynaweb_docs/0620/SGI_Developer/books/ClrC_CG/sgi_html/ch02.html

SSD - Solid State Drive

Here is a new one by Intel.

http://techreport.com/articles.x/15433

SAP - Systems, Applications and Products

Here is a link that talks about it:

http://www.sap-basis-abap.com/what002.htm

MMO (MMOG) - Massively Multiplayer Online Game

http://en.wikipedia.org/wiki/Massively_multiplayer_online_game

A massively multiplayer online game (also called MMOG or simply MMO) is a video game which is capable of supporting hundreds or thousands of players simultaneously. By necessity, they are played on the Internet, and feature at least one persistent world. They are, however, not necessarily games played on personal computers. Most of the newer game consoles, including the Xbox 360, PlayStation Portable, PlayStation 3, Nintendo DS and Wii can access the Internet and thus can have MMO genre games.

MMOGs can enable players to cooperate and compete with each other on a large scale, and sometimes to interact meaningfully with people around the world. They include a variety of gameplay types, representing many video game genres.

NRN

What does NRN stand for?

None of the ones here look right: http://acronyms.thefreedictionary.com/NRN

I found it!!!!!!! http://www.dscr.dla.mil/rmf/policies/milstrip.pdf

It stand for:

National Geospatial-Intelligence Agency Reference Number (NRN)

The NRN is a variable length number (up to 15 characters) used to completely identify a map product. The NRN is used when ordering non-NSN assigned products and under certain conditions can be used in MILSTRIP/FEDSTRIP. The NRN consists of a product series (up to the first five character spaces) and Product Number (up to ten character spaces), which relates intelligence data about the item. The first five positions are the Series which is "X" filled for MILSTRIP, e.g., M745 L3546 becomes M745XL3546 when using MILSTRIP/FEDSTRIP. When ordering using a NRN, use Document Identifier Code "A0D" for CONUS or "A04" for OCONUS activities.

DR - Deficiency Report

Found on the acronym site here: http://acronyms.thefreedictionary.com/DR

Can also stand for Damage Reduction (Dungeons & Dragons gaming).

ER - Engineering Release

Found on the acronym site here: http://acronyms.thefreedictionary.com/ER