How to identify chip packages/Transistor outline

=TO: Transistor Outline= Metal TO packages called Metal Header Package or Metal Can. Plastic TO packages referred to as 'Plastic Header Package', are generally a black plastic package with a back metal heat sink and one side with two of more pins

=PAK=
 * DPAK, TO-252
 * D2PAK, TO-263
 * D2PAK/A
 * D3PAK, TO-268
 * SPAK
 * PPAK
 * P2PAK
 * P2PAK/A
 * IPAK, TO-251
 * I2PAK, TO-262
 * I2SPAK

=ISO/WATT=
 * ISOWATT
 * ISOTOP
 * PENTAWATT
 * HEPTAWATT
 * MULTIWATT