Compression rate 

 (size after compression / size before compression) x 100 [%]. 

 Symbol (Character) 

 One processing unit of input data for compression processing. 
 In this system, select from BYTE, WORD, DWORD. 

 sign 

 Minimum unit of output data for compression processing. Specified for each method. 

 Run-length method 

 A data compression method that replaces input data with run length and value. 

 Run length 

 This is the number of consecutive inputs with the same value. 

 Unmatched sequence 

 Run length method has a short run length and swells 
 in normal processing It is a section.