We know that Dalvik uses APK, DEX, and ODEX files.
And we know this abbreviation means via AOSP source or Developers site.

(like this - <https://source.android.com/devices/tech/dalvik/dex-format.html>)

* DEX means Dalvik EXcutable file.
* ODEX means Optimized Dalvik EXcutable file.
* APK means Android PacKage.

ART (Android RunTime) uses OAT and ART, but they do not explain the meaning anywhere.

Does anyone know the meaning of these shortened words?