What is word/verbal arithmetic/symbol matrix/alphametics?

Word/verbal arithmetic/symbol matrix/alphametics is a special form of mathematical puzzle in which the aim is to reconstruct an equation in which the digits have been replaced by symbols or letters. Usually, each digit is represented by only one symbol, and the first symbol of a number cannot stand for 0.

GC Wizard recognizes the following four types:

Alphametics

Normal

SEND + MORE = MONEY

Grid

ACE + DEC = JFD
- + -
AAA - HFC = GI
= = =
AH + III + JBJ

Symbol matrix

Normal

A * B = 1428
C - D = 12
A * C = 840
B - D = 33

Grid

A * B = 1428
* -
C - D = 12
= =
840 33